If you expect Leetcode-style problems in the interview and are actually interested in doing your best there, why wouldn't you prepare for that?

That is the thing, I don't expect them, other than for newly graduates without anything else to show their value for.

Yeah, it's weird (to me and you at least) why people bother quizzing industry veterans. After 10 years in the workforce you should be able to talk shop about various experiences you had at work (NDA permitting) and drop down to technical details where appropriate. Yet some companies or interviewers insist on techniques that could be replaced with asking the potential hire to eat boogers on camera for a stronger signal of what they're actually looking for.

Even if that's the way it should be, it's not reality.

You can study for the interviews you'd like to have, or the ones you'll actually have.