Having only been exposed to IRAF, I can only speak about it... But the software is possibly the least user friendly thing avaliable for any OS. It feels like it was written before keyboards had backspace keys... More importantly, it seems as if it comes from an era when most serious computer users stared at a black screen for hours on end. Many people these days are unfimilar with even DOS, so even the lack of the most basic of GUIs makes learning the softwear a difficult and confusing process.

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"I'm making wheatloaf. It's like meatloaf, only with wheat"
"Isn't that just...bread?"