Same here. Firefox Focus has worked excellently as my default phone browser for years. I feel confident clicking randomly on cookie popups, knowing all the cookies will be gone by the time I close the page so they don't matter.

When set as the default brower, it also provides the in-app web view to other apps (e.g. inside LinkedIn). There it works fine too (also with that cookie-deleting confidence), and it has a drop-down to "Open in Firefox Focus", which is rarely needed but I found it useful for the full experience outside the app web view. That opens near-instantly without reloading, as it just transfers the already open page state.