Where have I said that there help for boom is the main thing that they are delivering?

There involvment will help and some of their work will be upsteamed and that will help other people do the same. Also the maintainer will work for them and have access to a lot of knowlage and get some time to maintain the project.

Also there are many interesting projects that do care about using better tools such as Chisel, you also don't need 'leading edge processes' for every application either.

Any improvment on Boom will help projects such as Low Risc.