There's an interesting amount of misinformation regarding MTX in Diablo Immortal. But the TL;DR is that the significant gameplay advantages from MTX only really apply at higher Paragon levels, especially not before lv. 60. The primary way of increasing power before that is the same as it was in any Diablo; get better gear, which can't be accelerated by MTX at all.
That said, post-60 there are still a few systemic issues surprisingly not explicitly tied to the existence of MTX. (required grouping for dungeons is not fun)
There's an interesting amount of misinformation regarding MTX in Diablo Immortal. But the TL;DR is that the significant gameplay advantages from MTX only really apply at higher Paragon levels, especially not before lv. 60. The primary way of increasing power before that is the same as it was in any Diablo; get better gear, which can't be accelerated by MTX at all.
That said, post-60 there are still a few systemic issues surprisingly not explicitly tied to the existence of MTX. (required grouping for dungeons is not fun)