What a waste of government time and spending.
If it's on a screen in a browser, probably. If it's printed, or on a display not under a reader's control, probably not.
FWIW, I'm partially split. I generally prefer sans-serif overall - have for decades. I think I slightly prefer serif for some printed material visually, but... when I actually have to engage and read it, for long periods, I think I tend to opt for sans-serif. Noticed this on my kindle years ago, and kindle reader now - I usually swap to sans-serif options (I think it's been my default for a while).
You sound like someone saying we shouldn’t have ramps and elevators because crutches exist.
The wild thing is that even if you don’t respect the switch to Calibri on the grounds that it doesn’t really benefit anyone and is therefore wasted effort for little or no gain, the decision to switch back is a decision to double that wasted effort.
That said, it’s clear from the daring fireball story linked in the thread that this is being super overblown and Rubio isn’t really making an argument that Calibri is wasting money. This is an arbitrary decision.
I think Calibri is arguably a better font, to me the bigger issue is the commercial license used in govt works.