It's my understanding that BMW is running a very small run on this platform. I believe that as the Bagger generation dies off so will the big air cooled platforms. Younger generation is efficient minded. And air cooled doesn't fill that space. Just meI think your point is that liquid-cooled engines are better. That's a flawed argument.
Better than what?
"Better at managing heat". Okay, but where?
"Better at managing heat in the engine". That's true, but so what!
They are "not" necessarily better (or worse) than managing the heat that the rider feels, although they might be different.
Liquid cooled engines do allow designers more freedom to design the engine, so it's easier to increase rpm, horsepower, etc. etc.
But not everyone (and I suppose almost none of us considering we're in the Indian forum) wants a 200mph plastic machine that sounds like a sewing machine.
There's no "better". A boxer (aircooled) engine is different from the vtwin (aircooled) engine which is different from a liquid-cooled v-twin which is different from all other engine configurations.
The fact that BMW for its entry into cruisers chose an air-cooled power plant shows that the rumours of air-cooled's demise is greatly exaggerated.