No sure about the new medicine but I have had Tamiflu in my home dozens of times for a family of 4 and it stops everything cold in our experience and it's only listed at under 40% or something like that.  When I say stops things cold I mean every single symptom just vanishes, the Paxlovid is way higher success I think and I hit all the boxes you mention so no hesitation on my part if indicated by a Dr.  I suspect the biggest problem with Tamiflu numbers being so low is getting a diagnosis within that 48 hour window, after that it works but not as well. It's tough to expect people to get a sniffle, recognize it might be Flu, get into an appointment and get tested all within 48 hours of onset, especially while traveling.  For me I know it instantly by that Flu migraine alongside the cough and fever all at once.  I think the only reason we have success with getting it on time is pre-existing conditions which make us vigilant and a Dr who sees us regularly and who works with my family as a team, stuff can breakdown anywhere in the middle and ruin the outcome - this is why I am researching ahead of travel. My Dr is very supportive with managing my care but not everyone has that
This sort of thing is why I wish we all had access to inexpensive at home Flu tests like we do for the Covid, especially when away from home traveling.  I was at Cape Cod this weekend for a $1500 trip and you can bet I had $40 worth of tests in my bag, we didn't need them but I had them. I would keep Flu too because why not?   Right now the Flu ones for at home are over $200 so it's cheaper to get a visit at a Dr or Urgent Care for a $30 co-pay to get the test, it's cheaper to get my whole family of 4 into a Dr with $30 copays each than get the test myself so we are all incentivized to gobble up provider appointments which isn't great IMO. Personally, I'd rather pay the $30 to buy tests, self monitor and seek out a Dr virtually ONLY once I know I need to bother my Dr, right now I am incentivized to take up time the Dr's can't really spare.
To each their own but as a high risk person I'd take it within a heartbeat of getting a positive result especially on vacation.  Truly, anything available to me to help me care for myself and not gobble up Dr visits and prevent severe illness is a thing I'll do at my own expense if I can manage it.  I really want to be able to travel freely again and this is the grease necessary for me to move away from my comfort zone.