I don't know about that container strategy, but the thing I like about monorepos in that situation is that you can enforce having every commit to master represe

I don't know about that container strategy, but the thing I like about monorepos in that situation is that you can enforce having every commit to master represent a state where all your services and tools work together. Otherwise if you ever need to do a rollback or post mortem or similar you have to figure out what commit out of the 20 different projects was actually being used at the time. Of course that comes at a cost and there are other ways to get the same benefit, but my experience is that this is an easy way to keep things consistent.