How does one send/accept brochure, price list, invoices, location etc on landline?
Landlines can go offline when municipality starts digging in the area. Plus they have problem like 'es marg ki sabhi line wyasta hai'. Not to mention, govt changes all landline numbers once in a decade.
I think it's still optional to replace stock dialer and sms app with truecaller. Regardless truecaller app sending log to its server on android, it doesn't matter if it can't do that on iPhones because it has others means of knowing about the calls. There's no hiding from the truecaller.