I like it design wise, but like a lot of these "de-clutter" tools it defaults to disabling security features without warning and will break some sites while making most sites slower. Plus it ironically installs a bunch of browser addons. So if you hit next, next, next you'll lose: Google Safebrowsing (security), malware scan (security), DNS over HTTPS (security and sometimes functionality), Automatic Browser Updates,…
It's making trade-offs, and differently than the Mozilla defaults. Google Safebrowsing reduces privacy (not because of the content, but because it says "hi Google, I'm running Firefox at this IP address"), DNS over HTTPS happily sends all your DNS queries to Cloudflare (and since we're arguing over functionality, breaks some split-horizon DNS), Widevine is blatantly anti-user, third-party cookies are a privacy problem, referers are a privacy problem, ... oh, actually the rest of your list from there is all privacy issues.
Anyways, the people who made this would say that Mozilla's current defaults get 0/10 from them and are simply awful, and that using them means your browsing experience will be objectively worse and less private.