Which is why there are Solution Architects who are (hopefully) familiar enough with the technical and business side of things to provide a high level solution overview and maybe a POC that will play into the scoping of the SOW.
Also helps if the same ppl who estimate (architects&#x2F;PMs) then end up being in charge of the project delivery.
This will keep them honest and prevent severe under-estimations while keeping them on the hook from over-estimating provided that there&#x27;s an internal review process for the estimates.