Hi Jacopo,
Thanks so much for your report!
We have already received a report on the problem regarding header/footer conditions and have created an improvement task: WIP: Header Not Showing In Template - #2 by itchycode
Regarding the theme styles: as long as you use the “exclude” conditions to exclude the “entire website” theme styles from other areas, it should actually work - at least it does on my test. If it doesn’t for you, please create a separate report on this issue
Best regards,
timmse