No disrespect felt, just expressing my opinion. As stated, I do feel it's very patronising to need a note to be able to do something that any other so called 'AB' can do without a note.
I live in a small community, so no notes needed. Social controle is high enough for someone to spill the beans if a kid isn't really sick.

Besides that point; this comes from a basis of equality. So called 'AB' or not; same treatment when skipping any classes.
For me it also it, but I do think it should be restricted to things that would mean getting an 'extra' or 'perk'. For instance, I'm fine with handing in all of my papers (and believe me, I do a lot), to get my disability pay, to get a co-payment to get upto an income on social pay level, to get my disability parking placard, to get my wheelchair, to get my bag of money to sort out my medical staff, well you get the picture.
No pedestal here either. However, I do think there is a HUGE cultural difference when talking about a GP. Our country is one of the very few in our western economy where a GP has such a heavy case load. Where a GP is an extra option in most countries (which you can bypass at will and or whim) for our system it's the basis of which all is built. A GP also has a bigger function than just fixing up a medical problem when it occurs. They keep an eye out on all of their patients for any psychosocial problems, relational problems, problems with raising kids, everything and anything that can go wrong or become difficult in a persons life. For instance; my GP will randomly visit patients of his practice whenever they get older, lonely or are at risk for medical problems. They didn't call to ask for this, he initiates.
Totally besides that anyhow, I do think it is time very poorly spend when my GP spends another hour on writing notes for me (read; his assistant writing it, him reading it and signing) when he could spend it doing true medical and psychosocial stuff.
To be honest? Scr*w those people! I'm not the most loved person when discussing some parts of the ADA or stuff that can be arranged in the US in regards to disabilities, as I do think some lack boundaries. But because of opinions of others doing something or not? Humbug! Really, everything I do or don't do gets checked by the appropriate gouvernment. I get no so called 'perk' what so ever without somebody behind a desk having to approve it. And guess what? There are more than enough people out there that feel they've been done wrong by because of the fact that I do get to use certain systems we've put in place for those with a disability. People will feel done wrong as soon as somebody else gets something different to provide equality, never mind how one got to the point of getting that treatment.
I'm probably getting myself in too much trouble, but oh well. I'm pretty sure this has a lot to do with the European mentality of things. Those of us with a disability are used to every day life with a lower standard of accessibility than our friends in the US are. This will translate in more people somehow finding their way to do DLRP without a Carte Blue and/or simply so used to not perfect accessibility they're happy enough with the basic state at DLRP. Heck, if people are even aware it exists.
There's also a very different point of view as to what a disability is, what is own responsibility and what is a need that needs to be addressed by a 'third party'. For me, it's most noticable when discussing alternate lines/waiting areas. It is very uncommon for me to run into any parent with a child with an autistic disorder that will state they require an alternate waiting area. Most will believe that their child will have to deal with that in daily life, so also when in line for a ride. A very different thing than what I'm reading on the DIS for the US. Or let's keep it a lot closer to home; myself. My disorder has a nasty side-effect that even a small unintentional bumping into me has a high risk of me ending up at an ER. I hardly ever hear anybody with this disorder about requiring alternate waiting area because of this, incl. myself. It's my daily life, as soon as I get out of the house there is the risk. I'm aware, I'm responsible for watching out for my safety. Yet, some of my US collegues at international boards have spoken up about feeling they do require alternate waiting areas because of this. I'm not saying one is 'better' than the other or not, but there also is a huge cultural difference playing a role in this subject.
Again; no disrespect felt. I can agree with you that the ADA has loopholes, and I'm not a great fan of that either. However, I do not see where needing notes for getting equal treatment is something to advocate. For me the difference lies between equality (which might come in a different form) and getting something extra out of it.