So you're saying that MVPs should be of mediocre quality?
If you're starting a grass cutting business, don't go buy a pickup truck, a trailer, and 3 of those orange ride/stand-on mowers.
Get a spreadsheet out and start signing up your customers.
Is that mediocre quality? No. It's not prematurely optimizing for something that may never happen.
Don't buy a pickup truck, a trailer, and 3 of those orange ride/stand-on mowers -- but the ONE mower you buy, make it the BEST DAMN MOWER you can afford, well-thought out best for precisely the kind of mowing jobs you plan to focus on. (And this is only a great analogy to software if your customer is going to be actually USING your mower themselves!)