When a custom CRM makes sense
Subscription CRMs are a good fit for a standard sales funnel: lead, qualified, proposal, won. They become a problem when the real process has steps they were not designed for, such as identity checks before an account opens, documents that need review, partners who earn commission on referred clients, or clients who need their own login to see their status.
Teams in that position usually end up with a CRM plus spreadsheets, shared inboxes and a separate portal, and nobody trusts the numbers. A custom CRM puts those steps in one place with one client record. If your process is standard, a subscription product is often the cheaper choice, and I will say so.