Do your clients ever sign it?
In the 5 years of running my own show, never once did a client actually sign a proposal I sent. They probably assumed, as did I, that the NDA I signed covered and superseded any of the legalese I had in a proposal.
The decade plus of consulting prior to that, I can’t think of a case where a client actually signed a proposal, but since I wasn’t in charge of receiving them, I can’t say for sure it never happened.
In the 5 plus years now of corporate life, I have never signed a proposal of any sort. Again, I am relying on the NDA. All I send to a vendor is a signed PO, which at most has payment and shipping terms.
I wonder what a lawyer would say?