My thought is- the airlines need to add a forward slide to the recline, such that the back of the seat doesnt recline back.. rather the seat part of the seat slides forward. Thus when you recline, you are taking up your OWN leg room.
If I am on a long flight, or am tired/want to sleep I'll recline my seat a smidge.. an inch or so, maybe 1/4 of how far the seat can actually recline. Makes it more comfortable, but doesn't take much space from the person behind me.
The only time I've interacted with a passenger over reclining was on a flight about 5-6 years ago. I had my tray table out, with my laptop sitting on it. The person in front of me suddenly reclined very fast, and the top of my laptop screen got "pinched" between the tray table latch area, and the tray table itself, and it cracked the glass on my screen. The person in front of me didn't even notice, and I had to ask them to un-recline so I could get my now-broken laptop out. They gave me some lip, it was noticed by a flight attendant, she made the guy un-recline so I could get my laptop out, and then he promptly reclined it (very quickly again) all the way back.
Of course the airline wasn't going to take liability for this, nor was the guy in front of me (and why should he? he didn't know).. but I'm now much more careful about how I have my laptop positioned on flights.
This sliding recline is now pretty standard among Asian carriers. I like it. The back is fixed and there is no impact on the person behind you if you choose to recline.