Yeah totally, I hope I didn't come across as trying to invalidate your opinion - the way you feel is pretty common and it's something we talk about a good amount!
I think a big aspect of Breach's lower success in matchmaking is also the burden of coordination he places on the team; since it's hard for him to capitalize off of his own utility, he tends to need to work with teammates more than other agents. We often see agents that require more coordination (Skye, Breach, Astra) have lower matchmaking winrates, but that doesn't mean their utility isn't objectively powerful or feel tough to play against. This is why you see some pretty damn powerful Breach plays in pro, but he's not quite as successful out in the wild.
Keep sharing your feedback with us, it's super valuable to understand our players' perspectives. Whenever you can frame your grievances as a balance issue (I genuinely think this character is too strong) vs. an experiential issue (regardless of power, I think this character is not enjoyable to play with/as/against), it's also helpful for us so we can strategize around what types of changes might be able to help alleviate those feelings.