Maybe I am not exactly what you mentioned, but I do feel OOP set us back about a decade or two and do think the general concept of microservices is a good idea. But maybe to your point, these beliefs are completely orthagonal to one another, and why they are mentioned as being related baffled me. To be honest the whole post baffled me and I am disappointed I can not downvote the submission. Anyway more to your topic- OOP in the early 2000s was put on this massive pedestal and trying to point out its flaws would often get you chastised or shunned, and labeled that you just didn't get OOP and such. But the object hierarchies often became their own source of inflexibility, and shoehorning something new into them could often be very difficult and often involve an hour or three of debate/meetings on how to best make teh change.

Microservices are more about making very concrete borders between components with an actual network in between them... and really a contract that has to be negotiated across teams. I feel the best thing this did was force a real conversation around the API boundary and contract, monoliths turn to a big ball of mud once a change slips through that passes in an entire object when just a field is needed, and after a few of these now everything is fairly tightly coupled- modern practices with PRs could prevent a lot of this, but there is still a lot of rubber stamping going on and they don't catch everything. Objects themselves are fine ideas, and I think OOP is great when you focus on composition over inheritance, and bonus points if the objects map cleanly into a relational database schema- once you are starting getting inheritance hierarchies, they often do not. If I had to guess, your experience with OOP is mostly using ORMs where you define the data and it spits out a table for you and some accessor methods, and that works... until it doesn't. At a certain level of complexity the ORM falls apart, and what I have seen in nearly every place I have worked at- is that at some point some innocuous change gets included and now all of a sudden a query does not use an index properly, and it works fine in dev, but then you push it to prod and the DB lights on fire and its really difficult to understand what happened. The style of programming you are talking about would be derided by some old heads as "C with objects" and not "really" OOP. But I do think you are onto something by taking the best parts and avoiding the bad.

"Micro" services aren't great when they are taken to their utmost tiny size, but the idea of a problem domain being well constrained into a deployable unit usually leads to better long term outcomes than a monolith, though its also very true that for under $10k you can get 32 cores of xeons and about 256 gigs of ram, and unless you are building something with intense compute requirements, that is going to get you a VERY long way in terms of concurrent users.