It's not a completely bad thing but ehh there are serious disadvantages, especially for gamers. I'm just glad I use Linux and will keep the change in mind in case I need to reinstall Windows on my gaming rig.
Btw TL;DR of the article is:
Windows 11 will automatically enable BitLocker on clean installs and re-installs.
OEMs will be able to enable it even on Windows 11 Home with a special UEFI flag (whatever that means).
BitLocker is a full-disk encryption technology by Microsoft. It provides better security since the data on the drive cannot be read without decrypting it (especially useful if someone steals the device) but the data cannot be recovered in case of forgetting the password or system malfunctions. Also it greatly decreases performance of the drive (by up to 45% on SSDs). This makes it unsuitable for many computer users.
The feature cannot be disabled by native means. If you want to disable it, use Rufus and select the appropriate flag when creating the bootable USB.