Like, substituting numbers for letters is a theoretically superior practice, but to me...it just makes things worse; like, my brain doesn't register it. I can follow x's generally well, but when you start introducing a, b, and c and then you start squaring them or whatever, it quickly gets overwhelming. Percentages within percentages is another annoying notation lore.
From now on, I'm just gonna try to ignore all of the allegedly "easier" notation and just solve problems the way I know how...even if they might not make intuitive sense. Most math doesn't anyway.