I think 3.5 handled the concept pretty well simply because PrCs allowed a narrowly defined mechanical narrative or thematic niche to be focused on with unique prereqs that could make taking a bunch of them require enough investments that potential synergistic gains were offset by the buyin enough to avoid trivial godliness.
Now in 5e I'm not sure that subclasses have enough power budget to do the concept justice without being free to revise core class mechanics. You can see that lack of power budget pretty clearly in the Arcane Archer subclass where the options it brings are just kinda meh if the GM doesn't do a lot of lifting via magic items or something to finish it. That could have been avoided if AA had replaced the extra attack chain with something on theme, but subclasses don't have that level of influence over base classes.
Now in 5e I'm not sure that subclasses have enough power budget to do the concept justice without being free to revise core class mechanics. You can see that lack of power budget pretty clearly in the Arcane Archer subclass where the options it brings are just kinda meh if the GM doesn't do a lot of lifting via magic items or something to finish it. That could have been avoided if AA had replaced the extra attack chain with something on theme, but subclasses don't have that level of influence over base classes.