Linking every TTRPG thing directly back to D&D is system reductionism! Under communism, there won't be D&D as we know it because it promotes and valorizes monarchism!
Besides damage dice you'll need at minimum two different D20 sets for DnD. One extra so the bad set can sit in Dice Jail™ until it's learned it's lesson.
I have no need for the sheer number of dice I have, but I have desire.
I got my literal gem dice (as in machined form semiprecious stones) because they were gorgeous. The same applies to my dichroic prism dice. I have my metal sets because I just like the feel of them; the heft in the hand and the satisfying *thunk* as they hit the dice tray from out the dice tower. I have several sets of dice because the colours appealed to me. (I tend to give these out to new players as I introduce them.) I have speciality dice (FUDGE/Fate dice, various Chinese dice, etc.) for the times I need them. And in the end it winds up with me having way more dice than I strictly speaking need.