This is how it was in 1.0 and unless you want to level and gear every class then you don't want to see this return. It would quickly become expected, especially for dps, to have multiple jobs geared or gtfo. Likely everyone would be required to start as BLM to aoe trash mobs then switch to monk for bosses. That was the standard in 1.0 and if you couldn't switch to those classes then you didn't get a party.