There's no solution that solves it. There never will be.

"Devs are lazy" boils down to management deciding to take a shortcut. Implementing a kernel level AC, as a "that will do" solution, instead if investing in a better one.

I dont know what you are suggesting with trust, that can only apply with private games. Valve do have a "trust factor" system too, which uses data from your entire Steam account to determine how likely you are to cheat or not.