thumb-key by one of the creators of Lemmy. It’s also very lightweight and snappy.
It took me a few days to learn though. Now it has become my 2nd nature. I type fast and effortlessly with it. I don’t even look at the keyboard anymore while typing.
It’s due to 2nd law of thermodynamics—everything tends towards disorder and decay.
Some states are probably eternal like death. A broken phone stays broken forever.
Some particles like protons and electrons are thought to last forever or ridiculously long. We never saw them decay.
That said, depending on your philosophical views, math and logic are not time dependent. 2+2 is always equal to 4 through all eternity.
I have used Flickboard too and I like both of them.
Flickboard is more advanced and supports a lot more customization. For example, it has macros which expand to symbols and text. You can create shortcuts for your email, math and currency symbols etc.
IME thumb-key is minimal, updated more frequently, and looks better out of the box. So I prefer it.