I was hoping they had snuck something a little bit less obviously Optimus like through, but they haven't really.
Isn't that just how this toyline works? (or Toylines in general?) The largest toys are almost inevitably 'hot seller' characters. Ever since they brought back Optimus Prime as a Power Master it's been this way. Action Master Optimus Prime was the largest Action Masters toy. Laser Optimus Prime was the largest Gen2 toy. Optimus Primal and Megatron, Optimal Optimus, Supreme Cheetor and Supreme Optimus Primal... heck, Omega Optimus Prime...
I understand there are some exceptions, but most of them (like, say, Unicron from Armada) were featured in the media to an insane degree. I think that the reason it's really noticeable with Prime and Bumblebee nowadays is because, well... there's SO MANY toys coming out nowadays. We've never seen anything remotely resembling this volume of toys in the history of the brand.
Or maybe you just don't care about how toylines actually work.
(That's probably the best attitude to take, as a toy collector.)