This is a great point @cipherw. I’ve very actively tried to avoid getting carried away by writing some crazy generic testing framework that can test every possible thing any blockchain could do (likely impossible haha). I’d much iteratively improve the tool by adding support for new types of transactions one at a time (if this new testing format doesn’t support one).
What I mean by this “goal”, to clarify, is that we (Coinbase) would like to test any transaction we would ever create in production. This is likely limited to the “focuses” you mentioned here in the near term (i.e. transfers, staking, account origination, governance). If there is some operation you would like an integrator/exchange to support that is more network-specific (like a one-off smart contract invocation), you should plan on making it possible to test automatically.