As I noted upthread, 3.X’s multiclassing rules were my favorite iteration. A large part of that was the sheer variety of ways you could create a martial spellcaster, especially those of the arcane variety. I even did a database style thread about arcane ones (link in my sig).
Why?
Because in FRPG games, I generally- but not always- want my characters to have some kind of supernatural ability without the use of gear. It could be class based or species based or ancestry based. Sure, I do sometimes play completely “mundane” PCSs, but they’re an exception to my usual playstyle.
Now, in all honesty, those supernatural abilities were not all based in multiclassing- some were based in other mechanics like feats or templates. Some of them were (or in the cases of unplayed ones, would be) a blast to play. But those other mechanics have never been easy or well-supported IMHO.
Why?
Because in FRPG games, I generally- but not always- want my characters to have some kind of supernatural ability without the use of gear. It could be class based or species based or ancestry based. Sure, I do sometimes play completely “mundane” PCSs, but they’re an exception to my usual playstyle.
Now, in all honesty, those supernatural abilities were not all based in multiclassing- some were based in other mechanics like feats or templates. Some of them were (or in the cases of unplayed ones, would be) a blast to play. But those other mechanics have never been easy or well-supported IMHO.