Enquiries reach you in whatever form the buyer feels like using: a form with three lines of text, a WhatsApp message with a photograph attached, a missed call, a reply to an email campaign. Somebody has to read each one, decide whether it deserves a seller's time, and act before the buyer goes elsewhere. In most growing businesses that somebody is already doing three other jobs. So the reading gets shallower as volume rises, the judgement changes with whoever is on duty, and the enquiry that mattered is recognised a day late.
Why it persists. Qualification is judgement work, and judgement is hard to write down. The criteria sit in the experience of one or two people who are too busy selling to document them. AI, meanwhile, looks like a project for a large company with a data team, or like a closed box that will start rejecting good enquiries without explanation. So the sensible-sounding decision is to keep reading by hand, and the cost stays hidden, because nobody counts the enquiries read too late or read too quickly.
If it stays unresolved. Volume is the thing that breaks it. Every additional enquiry makes the reading shallower and the queue longer, so the moment a business most needs sound qualification is the moment it does it worst. Teams in this position usually add people to the problem, which multiplies the inconsistency instead of removing it, and the enquiries nobody read are never counted.