If your company was bidding on a request for proposal (RFP) for a potential client, wouldn't you want to follow the customer's requirements?
Often RFP teams use failure to follow directions or specifics in a proposal submission as an informal measure of the likelihood the respondent will fail to deliver on other requirements.
I have worked for a company where I had spent 80 hours building a demo for a potential client. We did not make it to the demo phase due to a failure of our proposal writing team to address some technicality in the written proposal. I don't hold this against the client we lost; this falls on those whose jobs are solely writing and submitting technical proposals.