I presume that such schools actually enforce their rules...
My DDs went to a secondary that had a long list of uniform rules, would do spot checks on tucked in shirts, demanded kids take their coats off before going into the building, had a headteacher that had hopes of requiring dark coats even though it was on a main road with traffic issues, but rules about hair, makeup, anything to do skirts or trousers, the 'business smart' sixth form requirement, basically weren't a concern. Kids walking around in bike shorts wasn't uncommon.
I was even with staff as a parent representative for a new uniform supplier. I questioned a supplier around the skirt lengths available on their website, they openly said that while they occasionally stock longer lengths, they encourage their shop to sell skirts above the knee. The school's rules were below the knee. The school went with that supplier.
I told my kids when they started that they were agreeing to the school rules and I wouldn't argue with the school on those rules if they chose to risk detention or the like, that was on them but it was hard it care when not only did the school not care about doing so, they also didn't care that those children who were following them were being bullied for it.
When you're in that environment - and it's not that unusual for state schools in many places - it's so surprise parents disregard rules that they might elsewhere.
If so, then it appears one school (and staff) is worthy of respect and one not.
Or people give more value and put more effort for the things they choose.
I'm in a profession with that includes prestigious uniforms, bowing, and titles. Everyone who has been around for a while discussing when it was norm for people to get ripped apart or sent away for showing up in the wrong colour shoes -- and some places it still is.
I do bow and wear what I do and say what I do because it's part of my job that I chose so I'm willing to put in that effort -- but just because someone performs doesn't means there is total respect. A lot of things get said when the performance isn't on, and many of us have heard the stories of how the parents and students at the schools you're talking about are treated and talked about outside the classroom. I'm not convinced following the uniform or putting in effort means there is respect.