It was for nerds and geeks back then, and everybody knew and was fine with it or moved to different systems, some o fwhich never would have gotten so far if D&D always had been a plug and play product.
See it that way: If it had been perfect from the start, there never would have been the motivation for so many editions, expansions maybe, but not stuff like 4e which made a total different game out of D&D.
5e is so far the best version to play on the table, i did not occupy myself much with next / 5.5. because for me 5e pretty much got the perfect toolset and i do not play D&D on the table atm.
I would still do minor modifications, but if i have to, for a vanilla setting i can absolutely live, master and play with 5e RAW totally unmodified without getting a headache. So there you go