Oh yes ^^^ this. Where I work we recently upgraded from a single legacy product to another ERP, only for many secondary functions we went "best of breed" to additional SaaS products. It has had, literally, an exponential increase in the necessary resources to make them all work together. Keep in mind, the ERP we upgraded to also had modules for these secondary functions, but it was a case of Perfect-Is-The-Enemy-of-Good, and the sum of all parts is now much less than the mediocre Good we would have had with a single ecosystem.