Yeah, I think it was but I was just starting in programming and GOSUB didn't made much sense to me as it's not a proper structured programming procedure with input and output params but more like a hack with data passed through global variables. And by the time I learned structured programming I already moved to Pascal (HiSoft Pascal : https://www.cpcwiki.eu/index.php/Hisoft_Pascal ) and there was no turning back to BASIC.

First thing Hisoft Pascal did when you ran it was ask how much memory you wanted to reserve for the stack. (Or was that only in HiSoft C? I had both).