Many software developers usually have no need for something like Excel. Either they use some free/libre alternative, because they know about it existing, or they use an actual programming language, or some might even use something like Emacs org-mode spreadsheets, or they use some library like Pandas for things, where it is reasonable to get out the tools. Software developers are also more likely to be aware of the technical debt incurred by storing anything inside Excel formats and will avoid it, if they are wise.

As such many software developers rarely use Excel, if at all. I personally don't use it at all. All my simple spreadsheet needs are covered by Libreoffice Calc or Emacs org-mode. If I had to use Excel now, I would not know the names of functions (translated perhaps, because Excel does that silly stuff) or how to reference cells (Is it $ and then the number? And : as a separator between col and row?). So yeah, to properly use it, many of us would have to learn at least a little of it.

Many if not most cases of Excel usage are actually due to people not knowing the alternatives, or perhaps knowing they exist, but not having the knowledge to use them (like with programming and quickly dishing out a few Pandas calls or Emacs org mode spreadsheets).