The most common mid-drive and the most powerful one in wide use is the Bafang BBSHD it is a nominal 1500W unit. It could probably survive 2K Watts but you would still be FAR short of an e motorcycle. When you have 15K Watts onboard you are in e-motorcycle territory. Even the Cyclone mid-drive which is crude and rude and so uncivilized most people have never heard of it is only 3KW nominal. Way more powerful than many bicycle frames and drivetrains can handle but FAR short of 'motorcycle' capability. People wanting to cheap out on the donor bike that they use in e-bike builds is the most common with both hub and mid-drive add on kits.