As I said I was unsure if the balance was the primary reason or identity, I have heard both reasons as to why the class is limited. I have also said I do not agree with their reasoning and I have said it is 1000% possible to make a version of BLU everyone would be happy with and if you feel SE will be able to do such a job that would make both sides happy fantastic. I personally cannot get behind a full rework because I simply lack faith in the combat teams ability to do any rework that will not gut the aspects that I personally enjoy. In the end though it is not my choice and it is up to SE and I will simply roll with the punches with whatever path they choose. You are right it would make sense for SE to make changes to the game based off the feedback of the players that are playing said content but let us be real SE has an odd track record. Personally I would not have released BLU in the current state that it is in, I also would have put in the work to make BLU one of the first possible multi role jobs in the game. Yoshi-P clearly has a version of BLU that it cannot be balanced properly while keeping while keeping true to his view on the class identity of BLU. So that is why I simply do not think SE is willing to make a version of BLU that will make everyone happy since if they wanted to they could have done so since I do not think anyone thinks it is impossible to do so.
In the end some of you may have faith in SE to go back and make changes to BLU to make it into something everyone will be able to enjoy, but for me that is confusing since if that was really in the cards why not just do it from the start. Might not be fair of me to see it as an only two options but from other aspects SE to me has proven they are not really all that great at providing options and it does seem like it is a one or another approach. Since if I am not mistake didn't yoshi-p say something along the lines that unless they did something drastic jobs like BLU would properly never be added to the game? Clearly shows they have a ridged view.
Please do not misunderstand me, I truly wish BLU could be used in all forms of content while also leaving open the possibly to customize the play style with certain abilities even if it is just pseudo alterations at this point. My vision for BLU was to be one of the first multi role jobs. As said limited jobs have the potential to offer wildly unique experiences, sure BLU first foray is a rather sparse experience, and can most definitely use more means to establish long term engagement. It is far from perfect but personally I see the concept has potential and while I would rather see both blended together, I just do not see that happening with how ridged SE has shown to be. So if I had to pick between the two I have to pick expand and flesh out the limited job concept.