It starts out very nicely - with a “logical” organization to the data schema, but pretty soon you land up with a rats nest of indices, and “flattened tables” which all need to be kept in sync. So the problem goes from “hey here’s a black box to put my data into” … to … something like … “if you’re loading a LOT of data, then turn off index consistency checks, since they are slow - then load data, then update your indices”, or … “if your report is large go to flattened_table_xyz - not to the clean structure, and by the way we update the flattened table only once a week” !!

More interestingly - I don’t think the rdbms ever delivered on it’s promise of “your data all the time, anytime”.

Every reasonably large company that I know of spends many thousands of $$ on buying servers, disks, networks, and software — all to run a measly GL/AR/AP accounting system … and then guard access to the system like it was their first born!