The best systems I've worked on have all been well architected monoliths. The code is ugly as fuck in some places but that's what tech debt is.

If you release a bug to prod in your monolith, it is exactly the same as a dependent microservice releasing the same and bringing the cluster down. You get a crash either way, and at least with a monolith you're not spreading your call-stack over the network; it's all in memory.