It's less about utility...
The big requirement for many when considering the use of alternative Office tools is ease of exchange with MS Office users (they must be able to open/render your documents properly, and vice versa), along with round trip fidelity when working collaboratively with across different toolsets. You could argue that a lot of problems of this nature already exist when multiple versions of MS Office are involved, so what the hell, go for it.- but a lot of users will take a "better the Devil you know" attitude, no matter how good the alternatives are reported to be.
Wondering if breaking the MS Office habit on mobile devices will disrupt the stronghold on the Windows desktop, but I am not going to hold my breath for that.