Hi Mike,
To he honest I see a lot of “band wagon” jumping in “professional” reviewers and if one popular reviewer says something is a problem it tends to become a trope for the rest.
I personally found no issues with it, you can tap the slider as well which makes temperature go up and down. And also how many times or how much do you tend to change the temperature anyway.
Other annoying tropes on “professional” reviews water bottle storage tests, complaining about the boot features like hooks and how you have to fold sears from inside the car, fascination with the design of lights. Never actually saying whether they work at night well or not.
I’m going to get off my hobby horse now. But in conclusion those slidy things although unnecessary aren’t a major problem.
Cheers, all the very best
Vaun