Do caster out of combat options matter?

[Mastikator]

So a party that lacks a full caster but still wants to participate if the adventure involves mystery-solving and planehopping = tough cookies, they made their choice;

But a party whose wizard (or worse, anything with fixed spells known) that loaded up on utility spells and therefore is practically down a member when it comes to combat = the DM who doesn't accommodate that choice runs bad campaigns and should feel bad.

Isn't there a bit of a double standard there?

The only double standard on display in this thread is that the DM should bend over backwards to allow PCs to thrive out of combat when they picked absolutely zero out of combat features. But a PC that has out of combat features? Not only should they contend with being worse in combat, but irrelevant out of combat too.