Good grief, what's the difference between extended time in one bath versus shorter times in two baths? In my case I'm using a Jobo and reading while the machine spins, with one eye on the timer anyway. While I don't want to take two hours or anything doubling blix time is a complete shrug.
And as for colors etc. - again I compared a 6 and 3 bath kit from the same manufacturer and actually slightly preferred the 3 bath results. Not by any big margin as I doubt even the pickiest would have noted the difference unless looking closely for it side by side.
And it doesn't actually cost more to use the blix and discard when it comes in a kit of the same quantity as the other solutions. It would if you bought it separately.
I can understand preferring 6 when available but the fact they aren't readily available is really a non-issue.