That doesn't have to mean, and in fact should NOT mean, bland.
>> any day of the week
Bland biz comms are not only acceptable but preferred.
Succinct writing with some humor or at least some character to it will actually get that functional spec read.
Joe Spolsky wrote a good piece on this topic: https://www.joelonsoftware.com/2000/10/02/painless-functiona...
1) humor? it's subjective
2) you better be spot on because humor can easily be misinterpreted.
3) along the same lines, it's likely not everyone reading will be of the same native language and/or culture. Humor will likely marginalize them.
4) Frank Luntz "Words That Work". Chapter 1 is comms evergreen gold.
https://www.amazon.com/Words-That-Work-What-People/dp/140130...