What a coincidence! Maybe they're doing some changes! Just 10 minutes ago I disabled cageFS on one of the two remaining Plesk servers i had because it's been working like shit for days, filling up with .cagefs/tmp files and saturating my disk (30GB+ in less than an hour), and I was tired of wasting time debugging it, so I killed it 😂
That said, i don't know if this is replicable on Enhance. Every container has 1 user, which is shared with all addon domains. I think containing all the addons would mean a big change at the architectural level. For a users like me, who uses one "website" for one site (any addons are landing pages or related projects), this wouldn't be a great addition. For someone who puts 100 different sites (as addons) within one "website", it might make sense.
Enhance is designed for "1 container: 1 site" (users, ssh, php version, log, UI, unix user, redis, and so on), so I don't think it's worth investing resources in something that goes a bit against the grain.