This article neatly sums up why I jailbreak so I can keep/restore peak performance for my iPhones.
https://www.businessinsider.nl/appl...-to-distrust-2017-12/?international=true&r=US
I primarily use Speed Intensifier and NoSlowAnimation.
'Nuff said.
The fact that you posted this without someone even asking shows there's a lot of justification going on as to why people even bother anymore. LOL
It used to be many of the things people wanted to do couldn't be done without a jailbreak. Now, Apple has adopted nearly all of the 20 or so tweaks people wanted into their devices.
The one you brought up about the speed intensifier is a good one, and one I used a lot that Apple never has incorporated. Additionally, the more rows and more columns on the home screen was another reason.
With that said, whenever I'd jailbreak, I'd always be envious of friends who got the latest .x releases because they'd have a cool new feature, and I always had those couple apps I had to battle with jailbreak detection, and often just didn't work fully as a result, even when patched.
At the end of the day, if it were 5 years ago, the benefit of a jailbreak for me far outweighed the cost and sacrifice of being jailbroken. 2 years ago it was a balance between cost\benefit. Now the scales have tipped in favor of sticking with a pure device on Apple's latest iOS, as evidence by the ever shrinking jailbreak support community. If you want all those options, go Android... it's too much of a hassle and sacrifice on the iOS side now.
'Nuff said.