I'm a little on the fence about asking your personal dingus questions out loud. It's not quite old man yells at cloud but meh, I can take it or leave it. About the only thing I ever really do ask out loud is "who is this?" when hearing a song I don't know.
As helpful as this is, I'm usually not in a position to really do anything about it at that moment. I'm certainly not going to remember who Siri said was playing that song. So what I'd like is to be able to look back on the things I asked Siri at some later point. But you can't, it's all lost in the moment.
Alexa remembers. You can review all your questions is the app.
It's a shame there's no way I've found to look for similar with Siri. You'd think that would be a thing?
As KevinIL mentioned above, Amazon Echo/Alexa has a history. As for Siri, I don't know of a history place you can go to see what your previous interactions are. If none exist, it would be nice for Apple to add that. Most Siri interactions are local and not cloud based (from what Apple has told us).
Oh I'd love a Siri history feature. Dear Apple…