Cyberpunk 2077 isn't angsty, its dark.
And unlike say, TLOU2, the point of 2077 is that what you did really mattered.
There's a reason why, after you finish the game, Cyberpunk 2077 drops you off at the point of no return. A big part of the reason is because of Johnny and the open world, but I'd say just as big of a reason is the fact that 2077 is really designed for you to get all of its endings.
Especially The Devil, The Star, and The Sun, which are really important for understanding 2077's overall themes.
I'd actually go so far as to say that you haven't really beaten 2077 unless you've gotten The Devil and at least one other ending. There's too much context missing otherwise.
2077's developers believed gamers would be smart enough to figure stuff out; unfortunately, like most devs that trust in their players having even a modicum of intelligence and curiosity, their belief was denied.
Cyberpunk's 2077 themes including
-society is complacent in the crapsack world they've created
-technology will be used by corporations and the uber-rich to make themselves immortal at the cost of everyone else.
-being kept alive through technology is not actually living (Get it? It's called SOULKILLER because all of this over-reliance on technology in this desperate vein attempt to live forever KILLS YOUR SOUL! do you get it? DO YOU GET THE MESSAGE YET?!?)
-Everyone is in it for themselves, the sooner your aware of that the less it'll hurt when they backstab you
-we all have to die sometimes so it's best to die swinging and becoming a legend.
Bonus points
-toxic masculinity bad (Heavily implied with Johnny Silverhand)
-artificial intelligence is not really alive and it will be the death of us all (Heavily implied with Alt's point in the game)
These themes are not new or profound they've been in the mainstream philosophical stage ever since the Industrial Age, and honestly no, what you do doesn't matter, in fact, it can't matter. because if there is a definitive ending, let alone a defenitive happy ending, then how will they be able to milk the franchise with such hit sequels and spin-offs like Cyberpunk 2079, Cyberpunk 2084, Cyberpunk 2099, Cyberpunk 2105 and Cyberpunk: Cyber Warfare. It's hilarious honestly because for all of the accusations from movements like punk that claim, happy endings are just a piece of cheap boring commercial tripe, the punk movement itself has been heavily commercialized for decades if not since its very inception.
As for the game itself, Johnny is dead, Alt has become every AI clique in the book (Save for going all Skynet but don't worry they'll go their soon enough) and unless Project Red does a mass effect where your character and save data from the previous game carries over to the sequel, then V is likely dead or will be reduced to a cameo with the Arasaka Corporation inevitably recovering because again, got to have a villain to milk those sequels baby!
in a
very thick sense of Irony to the trope, it's cynical corporatized dribble pretending to be a rebel pretending to be much more philosophically deep than they actually are. (Which I mean most philosophies aren't that deep to begin with but that's another subject.) It's preachy, it's pretentious, it's the equivalent of the edgy teen trying to pretend he's grown up, and in such a game/world to quote Johnny from WarGames, "the only winning move is not to play."