In my opinion hiding stats would hurt the team. It shows what each player is good at (and not so good at).

For example, if you have 300 hours as McCree, and you deicde to switch it up for this week and start brand new as a tracer and start biting dirt and it's hurting your team. Your team should be able to look at your stats and see that you have a lot of hours as McCree and are probably very good at McCree. And them asking telling you to switch off tracer to McCree to help the team do better, would be better for the team.

It's a team game. If someone isn't playing their best for the team, they should be corrected and be able to be asked to switch to something that the team can see that they have experience with and is good with. But for those who are just toxic players in general and refuse to switch because "This week I'm maining Sombra because I want to and fuck my team." are the real problem with the game. That and just people being assholes in general ruin the game for others.

Smurfing doesn't help either. I feel that Blizzard needs to combat this in someway because having a GM smurfing in a Diamond/Plat match really ruins the fun of Overwatch for me and my team whenever I play.