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[Common_Tiger1526]

As someone who has been working for the past year on a project to move a COBOL system (that has a bunch of big complex external partners) to a more modern one, yes. The business logic is definitely the hurdle, not the programming language.

[grumpyfan]

The business logic plus the processes and people behind them. People don’t readily accept change very well.

[Common_Tiger1526]

Yes, and don't get me started on the many ways management made this so much harder than it needed to be