it simply means that, for someone used to the Roland OS, Korg do almost everything differently.
And for someone intimately used to a Korg, it is not in the least surprising to find them somewhat perplexed by how Roland do things.
Isn't that the case going from ANY kb manufacturer to another ?!? ...
To me, there is NO OS easier than technics ... but then I've only had technics and KORG ...