I'm purchasing an iPad Pro as a temporary replacement, until, probably, the second iteration of the ARM MacBook.
Software is, for sure, an issue—price, as well as availability. Even having to purchase multiple versions of software or re-buy something I've already purchased for another platform.
It's, definitely, frustrating.
My suggestion, for everyone who lands here, is to run S3D in a VM, and access it through your iPad.
I know that Mac VM's are harder to set up than Linux or Windows, but it's do-able, if you have to use a specific version.
I'd love an iOS version, but would prefer the devs to add more, and better, features to the current versions.
Also, and I'm not a dev, but I'm sure they, like everyone else, be working on ARM soon enough, due to upcoming architecture changes.