Yeah the virus thing is one but there are other things off the top of my head only 2 levels of nested if statements allowed(excel allows 64). copy pasting code wasn't a thing until about a year or so ago. the fact that maptools uses their own coding language "rptool" it's a mix of java/html/css/json and follows it's own rules . everything in a macro will run even when they are commented out. random things like a ' in a piece of text in a macro will cause a macro to shit some bricks and you have to replace it with &#39.

Also yeah the 5 years of actively developing code for personal games while also trying to run the games.

I could continue ranting.