Interestingly enough, there's been a reply by the Flutter engineering lead since you originally posted your comment saying they do plan to do something about this eventually: https://github.com/flutter/flutter/issues/59327#issuecomment...
> ...
> I've retitled the bug to specifically target the blinking cursor issue. I don't expect us to attack this soon, but it's on our radar. The best way to indicate your support for this or any other issue is to use the +1 button.
I don't get prioritizing based on 'popularity' contests. To me, 'a blinking cursor' taking up 10% CPU and 50MB RAM doesn't sound like a bug that needs one.
Of course, unless you are a team at Google having issues, then the flutter team's going all hands on deck: https://news.ycombinator.com/item?id=26333973