Quartz
Hero
Dual-classing was something that was horrible while you were enduring it and overpowered in the long run, so if that's what you like about it I would be interested to see what you propose.
I don't have a particular proposal in mind, just wondering - see below.
They are suppose to have Gestalt rules in the DMG (unless this got cut) which is also want you're talking about just not as restrictive as 1e dual classing. I would also not allow that unless the entire game was based on everyone using those rules.
I think I suggested Gestalt a while back in another thread.
I'd need to hear a very good, clear pitch as to what, exactly, the intention was; why the existing multiclass rules wouldn't support the concept in question; and why dual class style multiclassing would work for it.
It seems to me - and note that I've yet to play - that 5E is not so good for multiclassing as 3E. For instance, in 5E feats / stat increases are tied to class level, not character level; for instance in 3E certain classes meshed very well - fighter and rogue, and fighter (or knight) and monk are two excellent examples. Therefore I seek an alternative, and seek to draw on the experiences of those who do play and especially those who have played at a variety of levels.