Yes. Bazel is half of the equation. The other half which other enterprises rely on is the server side of Bazel's Remote Build protocol. There, the scheduler can be implemented with logic that accounts for sandbox sizing as well as other requirements/constraints.
I gave a talk about how we do it at BuildBuddy at a recent BazelCon here: https://youtu.be/iQqLtuBzkKE?t=848