And the type of deep analysis a knowledgeable fan might want is actually really hard to not only come up with live, but while watching something live without the benefit of watching a replay or a better camera angle.
At best, this kind of analysis is given a few minutes in between periods/quarters/halves/innings between commercial breaks and any other stories the network wants to cover.
Even if the announcer gets a generous 25 minutes between when the play happened and when they get a 2 minute spot to talk about it, that’s a pretty tight deadline to get a video package together and come up with some talking points. There aren’t a lot of people who have both the knowledge of the sport and the skill to put it together in a way that everyone will understand.
As an aside, there’s an installation at the Hockey Hall of Fame in Toronto that lets you try your hand at recapping a few games. It’s tough even with a script. The announcers are doing it live.