The big trade off is the ability to rewrite a large part of the system if a business pivot is needed. That was the bane of the previous company I worked in, eng

The big trade off is the ability to rewrite a large part of the system if a business pivot is needed. That was the bane of the previous company I worked in, engineering and operations was top notch unfortunately it was done too soon and it killed the company because it could not adjust to a moving market (ie customer and sales feedback was ignored because a lot of new features would require an architecture change that was daunting). It was very optimized for use cases that were becoming irrelevant. In my small startup where product market fit is still moving I always thank myself that everything is under engineered in a monolith when signing a big client that ask for adjustments.