Whereas I don't use it to arrange bookings.
I do use WA in my other life phone for very specific reasons eg groups essential to an activity. I find WA intrusive, slow to open particularly if I've had to turn my phone off, heavy on memory especially if people send photos and video, lost all chats when I upgraded my personal phone.
Regards my work phone I want the minimum number of apps on there for performance, and to be able to quickly and easily see everything in one place, without having to open different apps. Also the encryption has put me off using it, I don't know if this is currently the case but the authorities struggled to access WA - if I'm dead or in trouble I'd like to be found quickly and easily. Also requests to use WA are often associated with the enquirer wanting to send me a photo of himself, or 'get to know each other'.
Some of the places I travel to have very little signal, one dot of 4G is a luxury in my location and a city I travel to currently has incredibly poor signal quality in the centre. I do turn on Wi-Fi calling which works with texts if Wi-Fi is available works for both SMS text as well as calls.
I do have WA on a separate non-advertised number used for paid video/chat sessions, SP & performer support groups, keeping in contact with owned/subscribing subs (a BDSM term), sending photos from BDSM sessions (many subs want me to take photos during sessions). Still find it slow to open.
I do understand the benefits for example would save me 50p a text for enquiries from a non-UK mobile,and the same for sending screen shots of a conversation when someone denies contacting me & being difficult previously, but on the whole I'm sticking with SMS text, phone call, email.