I just found that multiple outputs is already in daily builds, so i made quick test with it. My findings are that all is working pretty well. The setup is quick and easy, especially if you work in 3ds Max 2024, UI is arguably less intuitive than it could be with dedicated mapping source node, but definitely not a deal breaker. One advantage of multiple outputs vs mapping source workflow is that former method lets you connect same textures to different materials and have different mapping on them - less nodes in the editor, easier to understand things. There are few disadvantages though, first, you lose correct material preview in viewport, second, mapping randomizer does not have controls over advanced bitmap features, like cropping, filtering, blurring, etc, and third, multiple otputs setup is taking slightly longer to setup, since you need to additionally lock from and to spinners in mapping randomizer, which is not an issue in 3ds Max 2024, but can be quite tedious in previous versions. The last issue could be easily resolved by Corona devs if they would add additional lock option in mapping randomizer. Anyway, i think it's pretty workable solution which i will be incorporating in my future materials.