Excel tables.

No Linux/OSS app can do this (and will likely never). Open Office devs have outright declared they won't.

Or the automated process that export/import data via excel.

Let's see you rebuild all those things, without man hours or errors. Costly errors.

Whenever someone gets on a "just switch" campaign (whether it's something like Linux or Metric), I know they've never had to work on a migration project and seen the challenges, difficulties, and risk.

I use Linux for servers, but I'll be damned if I'm gonna spend time converting my workstation - there's zero value in it for me when I have decades of tools and process. The value proposition just isn't there.

Don't go taking down a fence until you fully understand what it's for.