I mean, D&D 5E is generally constructed in a way that even small bonuses to rolls make a huge difference. Proficiency bonuses start with +2 and rise to a maximum of +6, while magical weapons give a maximum of +3.

So what in Avernus possessed the designers to allow a second-level spell to give a whooping +10 to Dexterity (Stealth) checks? For a group, no less (as long as they stick close to each other)? This is going to be extremely hard for guards and lookouts to match.