I agree its an amazing payment method, it worked for me for most of the time. Still, we depend on bank's stability and technical availability for it to work. Once i needed to pay for something and forgot my card at home, at that same time my bank was going trough technical issues and i couldn't pay.
Despite rare reliability issues, my fear about it is that it requires a phone. Being so popular, i fear when places will refuse any other form of payments and accept only PIX, making anybody not using a phone unable to buy their products, with the common assumption that everybody uses it ("don't you guys have phones???"). You can't install banking apps on rooted phones or alternative mobile OSs (or is very very hard), so you are trapped with Android or IOs to use it.
I hope it doesn't come to that, but it seems it's going that way.
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