D&D (2024) Should One D&D bring but Dual Classing

[Ruin Explorer]

part of me wants to say call what we do now dual classing and bring back multiclassing

Exactly.

What they're calling multiclassing isn't, it's just a modernized version of what 2E called dual-classing.

But it would be great to get real multiclassing back. I know various people have developed homebrew systems for it.