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> Is there any current major software written in Delphi?

That is not evidence for "no reason to exist".

The major reason for Delphi and/or Lazarus and/or Qt and/or similar WYSIWYG tool to exist is "when you want to produce a cross platform GUI application using a drag-and-drop form builder."

The fact that I can write a chat application that uses 30MB of RAM at runtime instead of 800MB like electron does is just icing on the cake.

FL Studio

https://www.embarcadero.com/case-study/image-line-software-c...

What important software is written in TS outside the SaaS crapware and libraries that enable it?

Inno Setup

https://jrsoftware.org/isinfo.php