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The more knowledgeable posters here will most likely be asking you for the following:
1. Please list your accounts that went to collections.
2. The date that each of them went to collections (usually 90+ days after your last payment to the original creditor).
3. Have you made ANY payments on the accounts AFTER they went to collections?
4. What state are you in?
Underwriting requirements for different types of loans, and with different creditors even with the same type of loan, vary greatly with respect to whether or not different types of delinquent debt require payment as a condition of approval.
Some, for example, may not require payment of medical collections.
If the mortgage specialist is offering opinions based on the specific type of loan and the underwrting requirements of that lendor for that loan, then the next issue is whether you intend to use that loan/lendor, or shop around for another.
You can often tailor your loan process to your own history, or tailor your payment decisions based on who you decide to app with.