Mary - I agree with you in that I also feel Deacon is doing exactly what he wants to be doing. I also believe that he probably finds it therapeutic in dealing with the loss of his father. If he did not want to do it, this new version of the Eagles probably would not have happened.
However, I see nothing wrong with people saying they hope Deacon goes on to pursue his own career in music or music production/engineering. That is simply their opinion. Everyone does not have to agree with it. Not that it matter at all, but I bet Deacon does not give a crap what we or anyone else thinks.