I agree Triumph is missing the segment of the younger "new" rider.
They seem focused on "premium" branding.
A 250/350 and a 500 cc option would close that gap.

The new Bajaj / Triumph alliance should fill the 250/350 gap at least in the Asian markets initially

It's not speeding till you get pulled over.
https://www.youtube.com/watch?v=Bqa1s4jhkQ8