Having a non-humaniform program for the sake of it being a nonhumaniform, when the galaxy, seeded by the Preservers, is clearly stacked towards humaniform, seems more racist, pandering and self-congratulatory to me, than validating the most common form, which also just happens to be your own.
Objection: assumes a preponderance not in evidence. As Spock noted, humanoid life forms are a minority in the galaxy. The Enterprise (and Voyager) ran across more because they went places humanoid life forms could be expected, on the grounds that they would be more likely to be able to meaningfully interact with beings that share similar sensory and environmental factors, but that is not the same thing as the galaxy being mostly or even largely humanoid.
Sustained - to a point. I'll concede that the true contents of the galaxy can only be speculated about; but the point about who would be using the sickbay most often stands, it seems.
Which sickbay?
All of them?
On every ship and every station
And dozens if not hundreds in every hospital on every one of a thousand planets or outposts...
The casualties in the dominion war was being calculated in the trillions, and what sort of ratio should we suspect is there between the ugly bags of mostly water and their light bulbs?
Once the mobile emitter becomes common, because Starfleet doesn't care how illegal it is, you'd have to think that it wouldn't be a roaming device for a hologram afforded the illusion of freedom, but more so every being and entity and person in the federation at need would be able to manifest their own emh to ix what ever is wrong with them.