Yes, that't true. But, the turth is, old tv shows wouldn;t sting so much if new tv shows were better (for me, anyway. I am not speaking for others).
For me, it's less worse / equal / better, more, "Was I entertained?"
Some modern TV shows I like:
Star Trek
Discovery (S1-2, haven't seen S3-5) / Short Treks / Picard
Lower Decks (S1-2, haven't seen S3-5) / Prodigy /
Haven't seen SNW yet.
Netflix Originals
Adventures of Puss in Boots (Shrek spin-off - moved to Peacock)
All of Us Are Dead (South Korean horror - zombies)
The Haunting of Hill House (miniseries)
The Haunting of Bly Manor (miniseries)
Midnight Mass (miniseries - don't read spoilers!!!

)
Jurassic World (Camp Cretaceous / Chaos Theory - animated)
Lost in Space (remake)
Stranger Things (this one is my favorite)
Sweet Home (South Korean horror - monsters)
Terminator Zero (anime)
The Umbrella Academy
Superhero Shows
Big Hero 6: The Series (following the film)
The Gifted (Marvel's Mutants on the run)
Gotham (Batman prequel)
Legion (secret son of Professor X learning he's a Mutant)
Superman & Lois (post-Metropolis)
Other Shows
Blue Bloods (cop show)
I tried to focus on shows from the last 10 years.