My bad, v tired when I replied. That is an interesting feature the only similar solution I can think of is using something like Fossify Dialer (a fork of the now ad-ridden and proprietary Simple Dialer) and use T9 dialing. That could achieve a similar speed / memorization as a gesture.
You could definitely get good enough at T9 to at least call people without looking at the screen.
Unless Proton OS is a consideration, I dont think a browser is a natural progression. There are plenty of private browser options already being developed (and I think the proton extensions cover most conveniences). The only way I'd see a Proton browser as a positive thing is if they went all in on ladybird or some other completely independent browser engine.