You use it, but it's all preprogrammed into the software you use, so you can focus on the bigger problems.

It's a bit like how microprocessors are designed modularly using programming language. No one physically lays out a transistor on a 7nm die, that's all dictated by code, where at the higher levels you just see "memory block" and "arithmetic block" or whatever.

Finite Element Analysis is some funky shit, though, and often that's done using bespoke software. You need to know the maths to build that, and it helps to have an understanding when interpreting the results. At least, it helps the person writing the report make a good report, though it's not like anyone else will know if they get it wrong.