Phonak Bolero Q90 M13 Hearing Aids

I read you wore only one for many years. Fitters I had talked to always wanted to sell two of them, and Costco wouldn't sell one of their cheaper models. I think my hearing has actually stayed the same or possibly got a little better than when I was actively searching them out but at that time my hearing was like 70% in one ear and 90% in the other (totally guessed at numbers) and I only wanted to bother with one for the 70% ear, then I could end up with 90% or so on both ears. some of the fitters wanted to improve the better ear instead which made no sense to me. have 70% and 100% instead of 90-90 seemed foolish.
but unless things get worse I won't be in the market but want to have this type of information in case it is needed.
thanks,
bumpy