Here I hope I'll be able to put it together in a way it's understandable this time.
Statement is "LN UX is shit"
That's a generalized statement that don't hold true when you consider the % of custodial vs non custodial use.
You come adding a new parameter and you say you want self custodial use. You change the equation. It's no longer "LN UX is shit" it's "LN self custodial UX is shit" (hard)
By adding a new parameter, you changed the initial statement, then you'll get a different answer.
You claim to know "Physics/C++/", yet you fail to understand, or you intentionally make a disingenuous argument when you add additional parameters to something, the outcome will likely change.
Are you admitting you don't know how simple equations work?
I hope that helps.

You might be like "crypto doesn't mean shit w/o self custody" that's your opinion (also mine) many just simply don't care. They just want and easy and cheap way to play w/ their shiny sats. Masses are not self custody cypherpunk crypto fundamentalists, and likely they'll never be.