Small events and side quests

I remember the days of Diablo and Diablo 2. A huge advantage was the ability to encounter characteristic, randomly generated side missions, such as the one with the butcher. Diablo 2 also featured randomized, small dungeons, some not too long, and some longer. There were also unique rewards, not skill points, but, for example, rare or unique gems or runes. I feel like these elements would have greatly enriched the campaign experience.