I wonder whose fault that is exactly. Did it just get neglected or were PMs fighting against “technical limitations”? Sometimes supporting the new shiny feature

I wonder whose fault that is exactly. Did it just get neglected or were PMs fighting against “technical limitations”? Sometimes supporting the new shiny feature means breaking the old one. If it’s not clear that the new one is a winner, some might hold onto the “better” (old) one and stale out. To me it’s insane how MSN Messenger and Skype got left out in the cold.