I wasn't trying to stir anyone up...
Look, the list was prefaced with "one or more of the following will apply". It was meant to be a general statement, not a criticism of any particular type of bike - I can't think of a single bike where ALL of my possible points apply.
I mean, if one bike was cheap, readily available, reliable, easy to get bits for, and made a good race bike, then we'd all be racing 'em!
So we all compromise in our choices - and when it comes to race bikes, most people make compromises that lean toward making life easier - stuff like parts availability and competitiveness rate highly.
And that's why we see seas of YZs, CRs and RMs.
Personally, I'd love to own and race a Phantom, a YZ250A, any number of different Montesas, a Cooper, an AT1MX, and several other non-mainstream bikes that you rarely see at the races, but they all fall down one one or more of the points I listed.
Away from the VMX racing scene, there's even more stuff I'd love to own, but don't... Even once competitiveness is taken out of the equation, one or more of my 6 reasons puts a stop to it...