It matters because it makes their product worse. I’m a customer so I’m impacted by using a crappier database that has higher costs and worse performance.
SQL Server is at least as good as any variant of MySQL and that’s only if you want to be very generous for MySQL.
If you meant that and I misunderstood, the other issue is that you don’t migrate to a different RDBMS. You rewrite half of the app and then spend a couple years fixing issues.
