MageOS is not a maintenance mode, unfortunately we don't do a good job expressing that.
The goal is to migrate management of the codebase out of Adobe's hands back into the community's. Community PRs, triage, etc.
We're currently working on getting the entire CI pipeline setup in Github Actions (if you're interested in contributing, we could really use friendly faces, it's quite an undertaking). Once we're past that, we have goals that are in progress:
DevX:
1. Correct the dep graph of MageOS to be a legitimate DAG and then use nx/bazel/make, etc to compute the build graph.
2. Create codespaces/gitpods/devcontainers for easier day 1 devs.
3. Rip GraphQl out into a separate package space.
4. Create smaller more use-case specific metapackages so that you're not forced into all of Magento or nothing.
5. Maintain backwards compatibility with existing Magento packages.
UX:
1. Significantly improve overall performance.
MerchX:
1. Improve Merch documentation and make Merch docs easier to consume.
Generally to your question, we're not interested in maintenance, we're interested in taking on the burden of being a better development effort alongside a better merchant experience.
That said, this is not a sales pitch. The problem is hard, but we'd like to prove that we're harder.