Why? If you don't care about spending extra for the dongles, after you've bought them there basically are no downsides to having to use them for legacy devices anymore, but all the advantages of USB-C still remain.
I don't understand why people get so worked up on the dongle thing anyway, for me it really is a non-issue, and I have only a single C-to-A cable. I do think Apple should not have been so damn greedy and just put a dongle in the box though, there really is no excuse for leaving it out considering the already crazy high price of the MBP 2016.