The failure mode
Indian GST compliance spreads the same transaction across several government portals and a local system that does not talk to any of them. Every invoice is entered more than once, e-way bills are generated in a separate place, and reconciliation is a monthly ritual performed by someone with a high tolerance for tedium.
Underneath it, a shared login. Everyone is an admin, nothing records who changed what, and the first time that matters is during a dispute.