3.5 was edition I played the most. It was a reason why I quit RPGs for nearly a decade because I hated it so much.
Every time I see another meme about how amazing 3.5 Tarrasque is, I remmember how amogn actual 3.5 players Tarrasque was the biggest joke. It was always brought up as definite proof designers have no idea how to make good monster. It was laughably easy to beat. A wizard could casually solo it, the same abilities people now miss in 3.5 amounted to ribbons. It was a laughingstock, forums had 100+ pages discussions how to fix it and general consensus was it';s beyond saving. It was first proof in 3.5 if you cannot use magic you're only good to roll over and die.
I honestly don't know if everyone claiming 3.5 Tarrasque is such a horrifying monster are trying to rewrite history or unintentionally proving what a broken, unplayable pile of garbage 3.5 was, if it's biggest punching bag is actually dangerous in a different, better designed game.
I've only played 2, 3 and 3.5. Read the rules for 4 when it came out and was not impressed in the slightest, and neither was anyone else in my group. Haven't even bothered with 5 except in the case of BG3 which uses it so I don't know if it's as simplified as 4 or if the simplicity was simply the video game format.
We never used a terrasque and it's not like I read every monster manual cover to cover. I'd skim through, see a cool picture and if the description of it was cool enough, I'd use it. The terrasque didn't pique my interest by its appearance so I never read anything else about it. I'm a huge fan of Modons though. Fuck yeah! Shapes!