Same here.
Earlier this year I consulted a company for evaluating whether to modernize their current ERP or buy a new one. What I found was a large clusterfun of an application inside a MSSQL database with Microsoft Access frontends and some glue code molded as .net application on Windows 10 in between accessing third party APIs.
Barely anything documented, thousands of stored procedures. When I asked how they roll out changes and perform tests I got this answer: “As few deployments as possible. Everytime we deployed new features, there have been always issues for a couple of days.”
