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Do they ever rebuild things? Or just add features ontop of features till the whole thing creaks.

Several years after a project completes when the system is finally sort of working and the end users know what to expect new management will come in at a high enough level and demand everything be rebuilt using their tech stack of choice because they need the resume entries.

Then of course you'll get a buggy second system that is back at square 0 which the business doesn't understand/hates and the developers hate because they're constantly fighting fires.

generally they wait until something explodes or they cannot add any features to the unmaintainable mess and they have no choice :)

Yep, this is what my experience is. It could be a cost explosion too, like using expensive mainframes and migrating to something else before the MIPS cost explodes.

Did somebody successfully migrated from a mainframe? Asking for a friend.

Yes, I've heard of some systems successfully migrating from the mainframe at my company. It tends to be a painful process. There are still some apps that need to be migrated.

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