Steam is a big reason that we are seeing more and more VN's get translated, and seeing more Japanese companies think of the west as a viable market, I really don't see the problem, like at all. If you don't like the comments from people on there, then ignore them. As far as the "muh good VN's are on the same platform as those plebian OELVN's) argument goes, it's not as if the two being on the same platform is tainting either of them. And if you want to get technical, you could make the same argument for non-Steam VN's as well, there are plenty of shitty ones out there, and plenty of good ones, neither really effects the quality of the other. Anyways, to say that you don't like popular VN's making their way onto Steam is basically the same as you saying you don't want the western VN market to grow.
Also this