It's all about context. Most UK users in modern housing have 50 to 100m2 lawns. They would consider a 46cm mower way too big, a petrol mower to be way too heavy, and petrol mowers are way more expensive than electric. That's why most UK retail mowers are electric in the range 34-40cm, many of them will be hover mowers which are much easier on small lawns than wheeled models.
If you have already have the batteries, then a bare Makita cordless costs roughly the same as corded and saves messing around with extension cables.
In my particular case, I have two lawns to cut. One is up steep steps, the other is at the back of a terrace so I have to carry the mower through the house. Neither are suitable for a petrol mowers due to access and size of lawn, plus cordless means one less thing to carry from the vehicle to the back of the house.