Boom isn't nearly as relevant as what Esperanto is trying to deliver. In fact, one can say Boom is the reason why companies have been reluctant to switch to RISC-V. Experienced engineers don't want a generator or other tools such as Chisel. They want standard synthesizable code and IP cores that were optimized for leading edge processes using standard CAD tools. This is what Esperanto is promising and is far more important than Boom.

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.