Well, in fact, choices made in scanning are always important, even if there's a mask. And there's a truckload of science behind it, too, which fortunately as amateur photographers we don't have to worry about too much most of the time! However, I do acknowledge that some scanning solutions may be thrown off if you feed them Phoenix and tell the system it's scanning a color negative. It'll be biased towards low contrast and RGB curves that are shifted in relation to each other (it's not just the mask), while in reality it'll be scanning a high-contrast material with much more parallel curves. The result is often a basically useless scan. However, even on these systems, a workaround may be to tell the machine it's scanning E6 slide film and then do the color balancing manually.
Phoenix has pretty limited dynamic range though
It does shoulder off, but it can still capture a decent range. The main challenge is the very high gamma, which makes it
seem (when optically printing or scanning in an inopportune way) that its dynamic range is more limited than it is in reality. Scanned properly, it has a reasonable dynamic range. Not as much as regular CN film, but adequate for many regular scenes. It will be a bit more finicky in terms of proper exposure to optimize its output. For regular pictorial use, it's a more challenging film than normal CN films. But personally I don't see why people would want to use this for regular pictorial use as there are way better alternatives for that; Phoenix' unique nature lends itself to highly specific, artistic uses.