> you're not the market
I think it's a bit too easy to use this to justify whatever decision you make. After all, you can always define your market to be whatever set of people like your product and are willing to put up with whatever set of restrictions is imposed.
That isn't to say that this is never a valid point to make, for example I think "if you don't see the point of this, you're not the market" is absolutely reasonable. I can also accept it when talking about the price.
However, I don't see how it applies to the Operating System restriction and to a lesser extent the complaints about Electron. My primary machines from work run Windows, but that doesn't say anything about the number of meetings I have, how much I prepare for them or what value this application has to me.
I see potential for this to be quite useful and would have no qualms paying the subscription fee if it turns out to save me time over my current workflow. I think that makes me part of the market for the tool. But I probably won't find out if it's useful or pay for it anytime soon because the application doesn't run on my machine. I can see many colleagues being in a similar boat.
If not fulfilling the system requirements automatically makes me "not the market" and you're happy doing your business constrained to "the market", then you're obviously allowed to do that. The authors, and hardly anyone else for that matter, owes me a Windows app or any other product. But I don't think saying "I'd use this, but I don't use macOS" is naysaying or implies "you can never build a successful business" if done respectfully. It enables the creators to gauge interest and decide whether to invest resources into opening up another segment of potential users.