I use AirPods daily with my 2015 MBP and never have disconnect issues. When I first got the AirPods it was far less reliable but I believe a firmware update a couple months after launch cleared up whatever issues I was having.
I happen to have two 2015 15" MBPs, both with Mojave installed. My personal laptop works flawlessly, no disconnects or issues. My work one has constant disconnects, unrecognized devices, etc. It's frustrating.