ezo
Get off my lawn!
This isn't quite accurate. UA introduced a new Method V. This wasn't the default by far and very rarely was it ever actually used IME.After UA:
Under the rules for UA single class characters chose class before rolling, they had a pool of dice based on the choice and anything below the minimum was raised to the minimum. After these rules came out the Lawful Good martials were all Paladins, and the non LG martials were mostly Cavaliers. Occasionally there was a Ranger thrown in there, but usually only on Elf or Half-Elf characters.
Also, Method V was ONLY for human characters. So, for Paladin's that ruled out half-elves (which was permitted in UA). And if you wanted to play a dwarf, your only choice for martial was Fighter (well, Thief too if you considered that a martial in 1E...). Any Elf (depending on subrace) or Half-Elf were Cavalier-types when possible. But the SEC roll also came into play, and few were happy to begin play as a 0-Level Horseman (some did however...).
YMMV, of course, but IME even after UA we had plenty of Fighters, Barbarians, and Thief-types. IF you actually played by the strict code for Cavaliers and Paladins, many players were not up to keeping to them enough to bother with the classes.
But yeah, if what I quoted was your experience, it was vastly different from mine!