So when is the criticism about the lack of representation allowed then? If we can't say anything when a straight white male main character is introduced (because, let's get real, we don't have the story details yet, but thanks to historic precedent, we can be 99% guaranteed he's straight) and developers keep introducing straight white male protagonists to the exclusion of others, as they have done for decades, by your statement, so long as the character is interesting, it should be immune from criticism about lack of diverse representation. So when can such criticism be given, if not during an example of the problem itself?
As I've said before, I can count how many positive representations of LGBTQ people there have been in video games on my hands, to say nothing about how many of them aren't main protagonists. Meanwhile, I can't even count the number of positive representations of straight protagonists, I'd need a spreadsheet to catalog them. Racial minorities have a similar issue to my own, and while the situation has improved for women in recent years, there's still a pretty wide gulf there. And, as a minority, the straight white male has become banal. Repeated over-exposure of ANYTHING has that effect on people, so you can't expect this to be any different. You can not like that fact, but it is what it is. If the worst thing you have to worry about is people finding straight white male protagonists played out and boring? Call me when it's 2019 and you're still contending with offensive and damaging stereotypes in what little representation you get; having a problem with people seeing the straight white male as "boring" comes off as small potatoes compared to what others contend with.
Until that disproportionality is resolved to make it seem like minority characters are less like tokenism or a fluke, the criticism needs to be voiced. But apparently, another example of that disproportionate representation isn't the time to discuss it, so....... when? When no one is paying attention?