If you think you would like to forever stop using SBT in favor of your own maven/gradle integration, just do it. If other people are impressed then great, if not who cares: you still get the build system you want to use that is better than what was there before.
I haven’t used SBT in over a year now. Work is on Bazel, personal projects are Mill. Old projects still on SBT get ported to Mill the next time I touch them. If you want to use SBT, that’s entirely your choice. If you want to use something else, you can do that. If you want other people who are paid to work on SBT to instead work for free on the thing you yourself find absurd to work on, I don’t think anyone can really help you lol.