I think its easy to get caught in the trap of thinking everything was better when you were a high school/college kid or Young Adult and didn't have the sort of responsibilities you do as you get older, both in career and in personal life. And sometimes it does actualy mean we watch lesser cricket than we used to, amongst other fun things. Guess that leads to inadvertent, or even advertent, nostalgia bias.
I mean, I loved the cricket in the 90s, it was great. And I loved watching India evolve into a powerhouse through the noughties. And all the other great cricket that happened then. But objectively, at least IMO, I think we are seeing the best era of test cricket, at the very least, of my lifetime right now. Guess I should say I only started following cricket from 1989/90 timeframe.
EDIT - I should add I was a pretty voracious reader of all cricket related stuff in the 90s, anything we could get our hands on in my city and I remember a lot of writers talking about a generational shift in how cricket is played and how the 90s, their current generation, was the best. One example I recall is a famed writer stating, the fielders dont just stand there and applaud a great cover drive like they did in the 70s and 80s. In the 90s, they dive and try to stop the boundary.
The nostalgia bias seems to be a very new (2010s) phenomenon, funnily enough.