I can speculate this can actually attract even more of the target audience to you. Mac people probably feel more enthusiastic about Mac-specific software announcements and are steadier to go and take a look at something Mac-specific than at yet another generic browser. And for the conversion rate - this probably even is a serious boost.
We have been getting slightly more constructive comments since changing the title, so thanks :D
And those enthusiastic about Mac, also care about things like how 'macOS' is written. Attention to detail matters and shows your own level of dilligence.
Interesting. I typically write it as macOS in conversation, but wasn't aware it was seen as correct to capitalise the M.