I love my X; love FaceID and am hopefully looking forward to having the same capabilities on an iPadPro and MacBookPro as well in the near future.
I use Siri to text, for alarms, timers, directions, weather, and to play music. I use him for HomeKit; for lighting and door locks. Finally, I use Siri for Apple Music and iTunes playlists and podcasts. I also use Siri for basic queries on the internet. Siri also works well for me with CarPlay and Apple Maps. Aside from laughable (truly funny) pronunciations of composers and titles, it works fine for me. Of course it has the occasional glitch, but I guess I expect that.
What is it that you want Siri to do, or perhaps that other assistants do, that it currently doesn't do? Maybe I'm not expecting enough from a voice assistant.