Definitely cost. $525 for the kit, $150 for the D26200, <$100 for the frame: that's less than $1000, while an equivalent COTS CNC would go for over $20k new and probably $5-10k for used-but-in-good-condition.
Plus it'd be much more compact. In the course of my former life as a small-"biz" hacker I had to move a one-ton router three or four times, and none of them were pleasant. Moreover, when later COVID hit we 'temporarily' stashed it in storage, and as things dragged on we ended up having to destroy it -- and let me tell you, even with people rotating off on the angle grinder it still took a full weekend to cut the thing apart, while a wood frame like the Maslow uses would take at most half an hour with a sawzall.