It's clear what was meant was "cost is no object, so it's not an issue" - law firms probably pay more per-employee for things like travel expenses or coffee each year than for MS Office licenses.

I have seen that MS Office suite has become a hammer used to drive many non-nails in various businesses, and would like to see people using more open standards. But I totally understand that for many use cases it's good enough and that people consider the cost to be not particularly significant