It it only the most lazy and selfish developers who would not utilize this. I am speaking as someone who has distributed both Rust and Go programs.
Even a once a year executable release would be better than just saying "build it yourself".
Please refrain from making ad-hominem attacks on people that make different decisions than you would, even if they’re anonymous.
Open-source developers make their own decisions for their own reasons. They donate their time and effort to provide something to the community, and only they are in a position to determine what activities are worth their time.
Are you calling the whole Gentoo community lazy ?
If anything, I'd consider them to be the opposite of lazy, since making sure that all software always builds properly on each of your users machines takes a lot of work (IMO much harder than only making sure that it builds on your package manager controlled servers), and Watts.