Of all the shows you mentioned the only ones I have watched is,
OITB (left it at after watching S04 I think), Master of None (both the seasons), I realise that its a drama that leans toward being a rom-com but I do not watch rom-coms at all. Kudos to Mindhunter, indeed that was entertaining and right in my ballpark. Liked House of cards till the time Spacey was there, S06 disappointed me. Season 1 of Making a Murderer was outstanding, season 2 didn't catch my interest. Also the last comedy I watched end-to-end I think was Entourage (which was produced by HBO), The Office (US) and Parks And Recreation, not surprisingly Netflix doesn't stream any of these in my region, Prime Video does the last two and Hotstar streams Entourage.

These are good shows not great ones like The Wire, The Sopranos, Mad Men, BB, Six Feet Under you know about the stuff that critics rave about etc. I don't care if Birdbox was watched by all of Netflix's subscribers, thats precisely the sort of thing that I don't watch the majority of the time, you watch that thing once and you forget that you ever watched it again. I'm now on probably my sixth or seventh rewatch of The Wire, that should tell you something about my viewing habits and why Netflix's content just doesn't work for me. I don't expect a network to consistenly churn out shows like that but at least some of the shows should be somewhere close to that level which HBO continues to do with The Deuce, Succession, True Detective(I know they fucked the dog on S02) etc.

Also you have the time to watch ALL of that, I don't. I work in tech too, I have an hour on weekdays and maybe 2-3 on weekends for leisure, so its only natural that I would be picky about what I watch, the absolute best, currently that would mean shows like The Americans, Escape from Dannemora and shows from the past like Halt and Catch Fire(from AMC), Six feet under, Deadwood which not surpisingly were also made by HBO. Netflix doesn't stream any of that.

I also don't understand how you think AMC won't exist, are they going to be insolvent ? Doesn't look like it, they have a cash-cow in The Walking Dead(I only watched till S06 then got bored) They got two of the best TV shows I liked BB and BCS, BCS is gonna kill it in the next season. They also produced The Terror, a brilliant mini-series which Netflix didn't stream as well and again Prime Video did. As a viewer I don't care about Netflix's subscriber numbers or HBO's lack thereof, I want to watch content I like which sadly Netflix doesn't produce on a consistent basis, this is entirely subjective and I realise that I might be one of the edge-cases in all the millenials when I say Netflix don't tickly my fancy.

I'm not biased towards HBO, hell HBO doesn't even stream in my country, I'm incredibly picky about what I watch since I'm short on time, Netflix churns out a LOT of shows, its only natural that some of them turn out to be brilliant and some of them indeed are, but the rest, like 90% of the shows are just average, they don't work for me, I simply do not have the time to watch them.

In that sense, Netflix is like the Y-Combinator of producing original content. You produce(invest in) hundreds of TV shows(startups) and hope one of them makes it big (becomes a unicorn) and the rest of them, well they would be probably cease to exist after some time.