While I generally agree, in my experience extremely few cell phone calls require the immediacy implied by them.
I'd love a screening system: "press 1 to make my phone ring", otherwise straight to voicemail where I'll also get informed via Voice -> Email if I don't check it sooner.
There is a good bit in Tim Ferriss's "4 Hour Work Week" where his voicemail tells people to email him, and he will only check his email once per day, in the morning, IIRC.
Which I've used, but it's a PITA rather than any real aid, especially w/o an Android phone. It also slows down and mildly annoys anyone who is calling you (maybe not a bad thing, but certainly not the same thing). And it's only really useful for people not in your contacts list, which is probably significantly less than 1/2 if you're not using it for work.
Plus, anyone not annoyed enough will still make your phone ring every time they call, demanding attention now to at least see who called. But I could do that before, with caller ID.
I'd love a screening system: "press 1 to make my phone ring", otherwise straight to voicemail where I'll also get informed via Voice -> Email if I don't check it sooner.