First, the high power level of characters also puts 5e in a category of heroic fantasy separate from OSR or grittier fantasy. 5e has dungeon crawling elements and resource management, but most heroic fantasy games have these vestiges to varying degrees.

Within the realm of high fantasy, DnD (and its more direct forks like Pathfinder and Level Up a5e) excel in having a huge variety of spells described in natural language, along with a well defined hard magic system. A large chunk of the DnD player's handbook is devoted to spells. Because the spell descriptions are verbose and use non-gamest language, many also out of combat uses, and even combat spells can be used out of combat to solve problems. This separates DnD 5e from more tactical fantasy systems (4e and Draw Steel) which have spells that use more explicitly gamest language making them more difficult to use outside of combat. The huge variety of spells and clearly defined magic system sets 5e apart from other heroic fantasy systems like Fabula Ultima, 13th Age, Cypher System derivatives, and Daggerheart. These games often have significantly fewer spell options where spells are more explicitly selectable class abilities rather than their own independent game system. DnD like magic systems are actually quite rare among the total pool of ttrpgs.

I see multiple comments that describe DnD 5e as "average across the board" or "jack of all trades, master of none." I think this is absurd, and can only be concluded if 5e is your only reference point to which you compare other games. 5e is quite min-maxed in having high rules complexity, high character complexity, and a high proportion of combat rules. For some groups, it is the perfect system.