WHMCS shipped its first release in 2007, and the shape of it hasn't fundamentally changed since — a core billing engine surrounded by a marketplace of third-party modules you're expected to buy to fill the gaps. That architecture made sense when hosting businesses were simpler and expectations were lower. It makes considerably less sense today, when clients expect instant provisioning, mobile-money-native payments, and a billing system that never shows a paid account as suspended.
"Delete WHMCS" sounds dramatic, but the migration itself is a well-understood engineering problem: export your client, service and invoice history, map it into a new schema, stand up the replacement billing core, run both systems in parallel for one or two billing cycles to confirm reconciliation matches exactly, then cut over. Done properly, clients never notice the switch — they just notice that the system now does things (automated mobile money reconciliation, instant reinstatement) it never used to.
I've run this migration for hosting providers who reached the point where the cost of staying on WHMCS — license renewals, module fees, staff hours spent working around sync issues — exceeded the cost of building something purpose-fit. A custom billing system by Mr Bismarck replaces the module marketplace with functionality that ships as part of the core platform: automation, African payment rails, and provisioning hooks that don't break every time an upstream module gets updated.