Some staff take up new software daily, others are reluctant to change from the tool they used three years ago. Our systems team does not support all the software people use, but people are prepared to read the manual to be able to use a piece of software they like if it is unsupported. We have some important differences 1. We are vendor-neutral. It does not apply to educational institutions.
Interoperability is a stated goal.
That is true of some businesses, and not of others. In summary, I am not saying that it is always a bad idea to have single-browser intranets, just that there are very strong reasons not to in most cases. I think education institutions are one of the cases where it is extremely unwise except in certain very narrowly defined circumstances. By Example, 2nd Ed.