It's probably as simple as people having something to spend their fighter perks on now.
With the strats grouped together the way they are now it's no feat for us bomber busters to figure out where you're headed, how high you are, how fast you are and how much time we have to head you off.
The Me163 is perfect for the job. It meets all the parameters for bomber formation interception and with people saving up ten years worth of fighter perks, this is a good way to spend them.