Non contingent financing purchase w/o loan letter?

Hi, I am in-contract for a unit where I'm taking out a loan but the deal isn't contingent on the loan. I just would rather have a mortgage then pay cash. I'm currently waiting for my loan commitment letter, but in the meantime, the bank has verified my approval for the loan and is waiting to approve the building & the lien search. Bank has verified my income, credit report, enough assets to close, etc--and appraisal came in ok. I'm working without a broker and the seller's broker won't submit my completed board package to the board until I get a loan commitment letter. Why?? Doesn't make sense to me. Can I please get some advisement?