tony_d123 ... BEAUTIFUL machine, congratulations.
Think it's a case of being content only with what you are familiar with / what you know.
Then, you went out and tried something NEW (not forgetting the MT-09 is almost 15 years NEWER than a FZS600), and you've seen the light. lol.
I've watched a lot of youtube videos of owners on their MT-09 / MT-07's, Reviews etc, lovely looking machines, plus the power to go with it.
I'd seriously consider going the same direction if I parted with my FZS 600.