>Upgrades to the low-code platform would break their custom implementation.

Likewise an upgrade would break our custom SAP implementation. Most all big ticket business apps are "low code" and suffer this problem.

>The underlying database structure was an absolute mess, especially after a bunch of incremental modifications.

Ditto with all enterprise software I have used.

All big businesses depend on low code enterprise apps. For that matter, a SQL database is a low-code platform.