There are really two things that happened, but they have the same underlying cause: The premises of the game weren't spelled out coherently. That allowed the production to get out of hand, and the hype to grow to unmanagable expectations and buyers to feel betrayed when it wasn't what they imagined.
Even the broad title "Cyberpunk" is suggestive of impossible scope, in the way that Microsoft has "Word" and "Office" - it would, at first glance, be claiming to cover all possible aspects of the cyberpunk experience. But it's actually an old TTRPG license, and so right off the bat the game is hamstrung in catering to 21st century consumer expectations by also having to incorporate the nostalgic mechanics and lore of a 20th century design.
Mechanically they are vastly different, with 2077 abandoning 99% of the mechanics and systems of the TTRPG to fit in as a modern video game. Nothing to be hanstrung by there.
Mechanically it's an open world looter shooter with tacked on crafting mechanics with a cyberpunk theme, literally par for the course for any modern game like this.
I'm flabbergasted by this comment. CP2077 is way more of a cyberpunk-themed GTA5 than I expected or wanted. Admittedly I avoided reading pretty much anything about the game before release to avoid the insane and impossible to live up to hype, but I can hardly wrap my head around the idea that there were people who wanted it to be more like a Rockstar game.