My sister went through this same issue a number of years ago.
She is a dedicated "MAC" person but was frustrated with BIAB there. Things that we (her 3 brothers) did with our PC versions, she simply could not do at all with her Mac version.

We finally convinced her to "go PC" and she similarly (to Sam) bought an inexpensive 2nd hand PC laptop, then used the PGMusic "crossgrade" program during one Christmas season, to switch.

She's been happy ever since!
She gets full usage of all the latest BIAB developments PLUS she's found a few other programs that are just not available for the Mac. She now has the best of both worlds (IMHO). Sure, she could have waited for the new "we're working on it" release for the Mac, but look at all the time she would have "wasted" being frustrated.

I don't say here that PC is better than Mac. I won't even go there. In fact, if the shoe would have been on the other foot, (i.e. if the Mac version was way ahead of the PC version), I'd have bought a used Mac and cross graded that way.

PGMusic has to look at their bottom line.
If it makes more sense (and more money) to spend time and resources on the PC, I suspect that is where they will continue to concentrate.

Just my CDN 2 cents worth <grin>
LLOYD S