suffixes have been going for a long time in the franchise, it's something I would consider iconic, numbers have been used too true, but they were used exactly opposed to how the localization team told us, which makes me believe that they simply used an excuse since they don't even know why they did it.

Regardless what's the point for SMN having Miasma 3 but not 2? (before even they reintroduced miasma 2 as a spell for sch btw)
with the iconic nomenclatura there won't be a problem, now there is.

So no, I don't buy their explanation and I'm against it, it's not even the first time the localization team has tried to be too clever for it's own good and frankly they should just stop