Clearly not, otherwise he would have given up by now.
Do DIYNOT verify members for Trade? How can you make such a broad statement from your experience here?
Minimum spec without visiting site would be every room on ground floor and landing with a sensor, any entry/exit doors have a contact.
I would agree to wire as much as possible and I wouldn't be bothered about the app.
If using two wired boxes you will need extra PSU, and be aware that ill illuminated bellboxes may need planning permission if branded.
Use one wire and one zone per device for wired stuff.
I think I answered everything...