Commercial Due Diligence

I’m interested in hearing from your experience whether commercial due diligence is regularly done during the due diligence process stage of the transaction. I’ve never actually seen this done at this stage. Primarily, the targets may be from an industry which acquirers is already involved and therefore there is the belief that they have the commercial information necessary or acquirer is acting on prior advice of a strategic advisor who would have identified the industry or possible targets.