No. But nice attempt to contort the argument.
You start making radical, bad faith assumptions of others' arguments unsupported by respective games' mechanics, lore, and settings, and
I'm the one contorting the argument by calling it out? Nah.
If you're making your own dungeons, you do not need this supplement
"If you don't want/need it, don't buy it" is the same flavor of "love it or leave it" false dichotomy that shuts down critique of a subject. Nah, I'll continue questioning this crap and the intention behind it all I like.
That's by far from the only reason one might be wheelchair-bound, but we're not even going into that yet.
More to the point, why would people need
wheelchairs in settings that have floating or flying items which can be ridden, magical prostheses, mundane or magical mounts small enough to fit not within your 10' wide hallways but 5' or smaller, entire sets of armor capable of restoring full mobility, restoration spells, shape change, teleportation, and magical hovering/flying entirely without the aid of an item.
"But magic is RAAARE!" bullshit. We're discussing adventurers, who even at level 1 are wealthier and have more access to magic and magical items than any commoner in a given setting. Half that shit I mentioned is, in D&D 5e, readily available in
tier 1 (levels 1-4) play. D&D 5e is the edition in which magical items are
least common and
hardest to acquire, and even under 5e circumstances is this shit available from the earliest adventurer levels.
You know what we call a mobility-impaired adventurer with a broom of flying and a harness? An adventurer. Brooms of flying are one of the most common and iconic low-level wondrous items in the whole damn game, right there with bags of holding, rings of protection, and cloaks of elvenkind.
Hell if you're wont for imagination you don't even have to go that far down the rabbit hole. Go for some kooky steampunk artificer shit that half the D&D settings nowadays already support, like a mobility automaton that has spider legs, or tracks, instead of wheels. Homebrew a common magical belt a character has, that provides a permanent partial levitation and functions akin to leg braces.
Actual magical leg braces. The list
literally goes on for someone conversant in the settings and mechanics,
that are internally consistent with the settings themselves and their central conceits.
Unlike most of the people who join the circle jerk over this nonsense,
I've actually played a disabled PC and have firsthand experience with it. I had some truly unfortunate rolls on the physical attributes, and worked that into the character's backstory that she was born with some form of palsy, abandoned in the woods to die (as historic custom), and adopted by a circle of druids. She was a druid/MoMF, and wild shape was her means of overcoming her disability.
Great fucking character.