Motorcycles are an extremely niche class. Their role is to basically be an MG Nest on wheels. Regardless of them being a niche class, they should not be neglected. I believe there should be parity among all factions. All factions should have motorcycles in their research trees, as well just motorcycles added to the game
Britain:
A long time ago a Premium British Motorcycle squad was added in the Tunisia campaign. I think this vehicle should be reimplemented as a research vehicle. Britain may not be its own independent faction yet but they should still be treated with integrity. I feel at bare minimum every faction, and yes that includes the mini Brits and Italians, should have 1 of everything same as each other
Soviets:
M-72, standard motorcycle of WW2 armed with a DP 27 MG, this should be research
TIZ AM 600, prewar motorcycle that was armed with a DT machine gun, would make for a good event vehicle, the driver is the gunner, would be the 2 seat plus sidecar variant so you have 3 lives for the MG
Germany already has a Motorcycle that is armed with a MG 34. It would be cool to add a variant with a MG 42, perhaps for an event
Italy:
Moto Guzzi 500 Alce, notably used by the Bersaglieri, unlike other motorcycles the MG is at the front of the bike so the driver is the gunner, I would suggest adding it as the 2 seat plus sidecar variant because each soldier basically acts as a life for the MG
Japan:
Type 97 Rikuo, Japan’s standard motorcycle. Could be equipped with a variety of MGs like the Type 11 and Type 97. I think it would be cool to have multiple. Perhaps make one research, and the others can be event or Premium