I think the vast majority, if not all, are looking for the "faster" method, so they are looking for which method is used by Max Park, Feliks Zemdegs, Leo Borromeo, Tymon and others. They discover that everyone uses CFOP and they decide to learn that method, because they want to be faster. That has led to very few people choosing to use other types of methods, even Roux, which is a method that in my opinion is at the level of CFOP or maybe more, has few users compared to CFOP users.
Petrus is not exempt from this.
In my case, however, I was looking for more efficient methods, there was a time when I was learning CFOP, I managed to learn full PLL and about half of OLL cases but it did not convince me, I did not feel comfortable and I started to learn new methods, Corners First, Columns first, Waterman, Petrus, Roux and more. Many of them seemed interesting to me, but with Petrus I found that you need to have ingenuity to build blocks, you need to acquire a spatial vision of the cube, the same happens with methods like Roux or Heise. That is why many do not choose both Roux and Petrus, they prefer to use CFOP, which is a pure and practically mechanical method of memorization, rather than intuitive assembly. The blocks in Petrus and Roux must be assembled intuitively, develop spatial vision, and be creative.
In addition, other factors must be taken into account, methods such as Petrus, Roux, ZZ or Heise require less movements, in the case of some of them less memorization, and are more efficient in FMC, this is also something that interests me a lot, not just speed resolution.
