I'm 185cm and I couldn't imagine having to endure a long haul flight without reclining.
I never get these discussions. It's only ever online that I see complaints. Almost everyone reclines on long flights. It's normal. It's expected. If it makes you uncomfortable that's a you problem, everyone else seems fine with it. If it makes you physically uncomfortable, pay for extra leg room. Don't make your problem the problem of another passenger.
> I never get these discussions. It's only ever online that I see complaints. everyone else seems fine with it
That's a skewed conclusion you're drawing. Are you really surprised that people aren't willing to risk escalating the situation on a plane, arguing with what's likely the very inconsiderate person in front of them? Most people have an aversion to conflict. It doesn't mean "they're fine with it". You probably don’t advertise in real life how much you lean back and not care who’s behind you out of fear that people will change your opinion of you. Real life is a harsh mistress.
I've bumped into people and they said "sorry", do you think they wanted me to bump into them, liked it, and actually believed it was their mistake? No, I just tower at close to 2m so they didn't want to escalate the situation.
P.S. I always look at who sits behind me, if they're "space constrained" or not, and almost always ask if I can recline. Sometimes I don't bother, clearly the person will suffer. Sometimes they said "I'd rather not, thank you". Many times they said "fine". I used to fly a lot and my experience was very clearly not that "everyone is fine". I was never fine even if I didn't start arguing. So how would you have known?
Anecdotal, but I'm 193cm, take a few 12+ hour flights per year, and have no problem not reclining. For what it's worth, I feel like I've experienced people on my shorter, domestic flights reclining their seats more often than on my longer, international flights.