We have two Siemens ovens from a recent kitchen refurb. Fancy features / usefulness as follows…
Pyrolitic cleaning - really useful and only need to remove the shelves, not the side mounts (unlike on a previous AEG one)
Steam - marginally useful when roasting a chicken or making bread, but could easily live without
Automatic food programmes - not at all useful and don’t really trust them
Internal temperature probe - haven’t got the hang of this yet and I can see it being a bit of a faff.
Fast heat up function - totally brilliant. Oven goes from 0 - 200c in under 5 mins.
Wi-Fi connectivity - slightly useful, if you don’t mind lots of notifications from your oven. Can set it going remotely from phone, which so far I’ve done once.