As a user of all, Google Assistant and Alexa are miles ahead of Siri. Initially I just had Siri, and like you assumed they were all like that. Not the case. No more 'here's what I found on the web' or just not being able to help. Are they integral to my daily life, no, but definitely save time. Siri is just for timers and reminders for me.
I've been a long term Alexa user and kinda hard to get out of the ecosystem, but it's gone downhill fast in the last few years in terms of the UX.
* It forgets about my configured routine ("good night" -> "turn off all lights", now it would randomly reply "good night" and does nothing).
* It keeps trying to push down other services/products on top with long winded follow up question. There's no way to turn this off
* Keep asking if it's answering from the correct room
* Its ability to understand my command has gone downhill - and I'm just ordering it to turn the lights on and off in certain rooms. Now it keeps saying "cannot find bedroom" for example even though there's clearly a group called "Bedroom" set up in Alexa
