Re: But look at the response to April in the Twitter thread
"Who's calling who "legacy"?"
"Legacy" is used at Boardroom Level to indicate stuff the youngsters don't understand because they don't bother teaching it in school anymore. It must be eradicated at all costs, because it's not new and shiny.
If you want to see a C-suite member go apoplectic, point out that all his financial assets are handled by Legacy Mainframes running Legacy COBOL and Legacy Fortran.