"Not really. I mean, we're not talking about a AAA game here for one. And second, compatibility issues is the key word here. A lot of indies are able to ship games that are considered good port, without any major issues. They didn't go through extensive testing through a wide range of configuration. Because there are multiple standards and middleware that are supposed to handle all these hardware configurations, which are supposed to comply to said standards."
Yup. The idea that PC games require a lot of testing for different hardware configurations is extremely antiquated.
As antiquated as No Man's Sky PS4 + PC release and their inability to cope? Several other examples from really good (technically) devs whose efforts were diluted by focusing on multiple platforms. And middleware doesn't come for free--you have to make an effort to be educated on it, use it properly, etc. etc.
The nightmare doesn't end on release either. Post-support on PC can not only be extremely painful and hard to manage, but the fallout from PC crowds who can't get the game working on their "souped up machines that should run everything, no question" can be extremely damaging and the total opposite of the good, simple, thing they're going for.
This isn't a "let's improve our dev capability" project, it's a "we want to get this out asap and be amazing for everyone who plays it" project. For that, it makes the most sense to release on a single, contained platform first.