If minor magical items were not included, feats would probably beat out multiclassing. Not everyone likes multiclassing or is likely to allow it at their tables. Feats in 5e are okay but again do require some thought when a PC gets the option to choose between them and an ASI at key levels.i wonder how different the poll results would be if minor magical items weren't included in that category?
I would even throw out subclasses before magic items.If minor magical items were not included, feats would probably beat out multiclassing. Not everyone likes multiclassing or is likely to allow it at their tables. Feats in 5e are okay but again do require some thought when a PC gets the option to choose between them and an ASI at key levels.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.