Yes, Windows 11 will need updates, too. And, Windows 11 machines will be actively receiving them.
After October Windows 10 machines will no longer be getting security updates, hence Intuit's panic.
Not everyone that uses Intuit's software can be trusted to use adequate additional aids to protect their data.
Can you imagine the outcry and damage to Intuit's reputation if half their customer base starts crying about getting their tax information hacked?
