You are right FF (and training standards vary hugely) but that's not really the issue.
For plain PPL VFR flying, arguably all you need is TAFs METARs and supposedly the F215, plus F214 so you can get the wind aloft for the circular slide rule
For IFR, it's different. The tactic depends on the aircraft performance.
I know nothing about jets but if you have anti-ice, radar, FL400 ceiling and can do +5000fpm, you will have certain things to watch but basically nothing much is going to bother you. You certainly won't be bothered whether the stratus tops are at 12k or 16k or where the 0C level is. You will get a certain kind of weather briefing.
OTOH if you are a piston with a 20k ceiling and can do +400fpm at 10k, +200fpm at 18k, then the objective is to climb to VMC and you need a much better picture of the 10k-20k weather and IMC extent and temperatures. You can't find this on any CAA approved UK Met Office briefing that I know of. (The UKMO does have the 3D data but they
sell it to commercial weather providers). One has to go to the GFS or other models; all on the internet and not taught in any formal syllabus.
It's funny how one person posts a one-liner question and we end up here, but it shows that there isn't a simple answer to these things. It's however very tempting to just say I have more important things to do.