In C++, there's 17 levels of precedence across 60 operators, with varying associativity.

In many languages, due to precedence, 1 + 2 * 3 = 7, but in others, like Smalltalk, it equals 9. In those languages, its purely left to right, with no precedence. But at a casual glance, they look identical. And for someone bouncing back and forth, they better ensure they have the right hat on when they start writing out equations.

In prefix languages, this is not an issue. Everything looks like a function.

+, -, sqrt, sin, draw.

You also can have niceties like (+ 1 2 3 4), which simply adds up all of the arguments, in contrast to (+ 1 (+ 2 (+ 3 4))). But, that's not different grammatically from (sin (sqrt (abs x))), (f1 (f2 (f3 x))), which appears like sin(sqrt(abs(x))) in infix languages, not much different really at all.

Clearly there are benefits to infix presentation, and for basic (or, even BASIC!) use its very approachable.

But underlying it, there's some definite complexity that you need to grok when the equations start to get complicated.