The problem: skilled people doing clerical work
Walk through most MSMEs at four in the afternoon and you will find experienced staff typing the same figures into a second system, matching a bank statement to invoices by eye, building a report that will be read once, or scrolling a chat history to find out whether a customer was reminded about payment. None of this work is difficult. All of it is expensive, because it is being done by people you hired for their judgement.
It is also fragile. When one person who knows the routine is on leave, the routine stops. Reports arrive late, follow-ups are missed, and the owner ends up doing the reconciliation personally at the weekend. Process debt like this rarely appears in any account, but it caps how large the business can get without adding headcount.