I’ll counterpick if I know how to play more than one character. I counterpick often in SFxT and InJustice. Though in games I only play one character like Blazblue I curse the heavens and clutch my teeth whenever I get a bad matchup.
Depends on character popularity. If you go 7-3 or worse against a common character, you should keep a counter on hand because you’ll be consistently handicapped. Toughing it out is silly when you’ll easily fight 2 or more of said character in 10 random matches.
How often you play characters that lose 2-8 or 3-7? A dumb MU is even worse because there’s no way to improve it. At least you can get good with your secondary.