People choose steam authenticator https://steamauthenticator.net/ and Steam Mobile Authentication Desktop Emulator for several good reasons:
Ease of use: Desktop authenticators provide a convenient way to get security codes right on your computer. There is no need to take out a mobile device or wait for an SMS.

Security: Data is generated locally on the computer, which reduces the likelihood of it being intercepted by intruders. This adds an extra layer of protection to your Steam account.

Flexibility: The ability to use an authenticator on your computer gives you the flexibility to work with your account. You can receive security codes even when your mobile device is not available.

Mobile App Emulation: The Steam Authentication Mobile App Emulator provides an almost identical mobile authenticator experience on a computer.

Compatible with various operating systems: Desktop authenticators supported on different versions of Windows (in this case Windows 7, Windows 8 and later) provide the ability to use the tool on different computer configurations.

Greater Confidence: Users can feel more confident in the security of their account knowing that the security codes are generated at their trusted access point.

No dependence on mobile connection: In case of poor mobile connection or temporary problems with the phone, the authenticator on the computer will still be available.

The combination of convenience, security and flexibility makes the Steam Desktop Authenticators and Mobile Authentication Desktop Emulators an attractive choice for many users.