Adrien 100% Agree, we really, really, need a proper cache and working web-server outside of Apache(slow, crashes, no caching), OLS(Broken SSO, doesn't support plugins), LiteSpeed(Too expensive for most clients, and isn't able to be configured to support full-page cache properly).
NGINX is the only viable solution currently for full-page cache, but NGINX is broken on WooCom and page-builders, making it un-usable, Redis would be a saving grace currently for big WooCom sites, I could happily do without S3(total waste of time in prod, slow and expensive) and the other fluff for better core updates to actual functionality already in place, i.e. getting NGINX prod ready.
Also, there is no way of enabling full-page cache by default, I hope we get Redis with the ability to enable it by default for WooCom packages at a per package level.
PHP Per package will be key for enabling a proper OpCache config uninformedly.