If we were really to blame for not having D2 charms, I think I’d wear that “responsibility” as a badge of honor.
I’d very much like some sort of charm concept to be in D4 (like MolaRams idea for example). But D2’s charms, as much as I enjoyed it for what it was in D2, is not a good idea. There is zero reason to copy it in D4 other than for nostalgia imo.
Though simply taking charms from D2 and add it to its own inventory is not a good idea either. That is just “more stuff/items”. It needs to have some unique aspect to it, like it did in D2.