TV shows are longer. And I don't mean double the length, but literally 100xtimes longer. There is a chance you accidentally find a channel with a program that really triggers your curiosity, and then you stop scrolling. On TikTok, this is not possible, after a couple seconds the mildly interesting content is gone. Good luck finding it again, or even remembering what you found interesting in the morning sitting on the toilet swearing "you'll check out this topic later"
Another aspect is the quality of the content, which, chances are, higher. Not all of the programmes, obviously, but, again, you might find a documentary, an art piece (aka movie), etc. On TikTok/instagram/yt/Facebook reels anyone can post any rubbish, without any curation, and it's up to some algorithm to decide if it's shown to you.
Not to mention the regimen you create, the ritual if you like, of sitting down in front of the TV at the time your beloved programme is aired.
I used to think a lot about the "it's the same as TV / newspaper / books used to be" argument, and I definitely believe it's not. Especially since I dated the "book reader" and the "insta story addict" persons and tried to have conversations with them about topics. Day and night.
In fact, I started going back to TV. Not the smartphone-controlled / streaming kind, but using the remote. And scrolling through the handful of channels I added to favorites. I do sometimes stop at a random program (yesterday I just learned that there are venomous beetles in Switzerland!). Sometimes I won't and switch the TV off, and just stare out on the windows.
TV doomscrolling is bad (news channels to the front). A bit less worse than "social media" (scrolling addiction). I kinda think the suggested meta observation (10-10-10) is worth to try.