The current version of the S2 app includes the capability to downgrade to S1. Go to “help and support” and you'll find it.
Your products have to be downgraded one by one, and they need to be 2020 or earlier.
I recently downgraded my two Play 3 speakers to S1 and now all the features are back and the response is instant, as it should be.
Simply reset your products to factory settings, then follow the instructions on the S2 app.
Once that is done, install the S1 app and create your Sonos system.
If you use the PC app as well, uninstall S2 using Windows Control Panel and download and install the S1 app in its place. It will then find your downgraded Sonos S1 system and connect to it. Everything then works as it should.
A note for those of you who use Samba on Linux to share your music library, if you use Samba version 4, you need to add two settings to your ‘sub.conf’ file, then restart ‘smbd’ and ‘nmbd’.
The settings are:
server min protocol = NT1
client min protocol = NT1
Your S1 system will then map the share and index the library.
If you have your library on a Windows machine, you don't have to concern yourself with that.
Hope this helps people.