TBF the ARM devkit comes with 32GB RAM and 512GB SSD, once you add that to the Mini it is decidedly more expensive. Plus you can upgrade the storage yourself which the Mini really should have especially with all the wasted space in the base model.
A lot of good that 32gb of RAM does when the OS can't even use it properly. When a 8gb Mac is outperforming your devkit, it's time to reevaluate your ARM plans
First come first serve though? Although I guess they already skipped the BSDs and Haiku...
When the only other notable ARM OS is Windows for ARM, that runs like garbage, is limited to expensive underpowered Qualcomm laptops, and who's marketshare for almost four years STILL hasn't made any significant changes, I doubt that. It's a repeat of the iPod and iPad again, where good competition never came and it dominated marketshare.
But hey that's good news for us, as no competition in the ARM space means Mac is the obvious choice for many, and we're getting switchers in droves. The Mac's marketshare is the highest it's ever been now. In the US alone it's now above 30%! Not even during the Mac vs PC days and with Windows' lowest points has it ever got to that point.