Single Sign On works beautifully in the Windows environment. Logon to one workstation, access any server's file or print shares, SQL server, IIS websites, and tons of third party software without any logon prompts but still with granular permissions.
One of those things people who say "I don't understand why anyone uses Windows" don't understand. Something so pervasive and convenient that "we" the industry have given up in moving everything to the web, along with standard menus, ubiquitous keyboard accelerators for menus and dialog boxes, scripting with the likes of COM, ActiveX, AppleScript, or embedded Python/Lua, local snapshots or volume shadow copy, tools like DNSpy and AutoHotkey and SysExporter able to introspect into running programs and their windows and system controls (and they generally weren't obfuscated javascript inside), being able to see different programs in task switchers without them all being wrapped in a web browser.
It was a different and in many ways better world 10-15 years ago.
The latter is the LDAP integrated thing - (re)using the same credentials for multiple/disparate services, controlled centrally.
The former ("true" single sign-on) is logging in once and accessing everything from there.
FWIW there are single sign-on services out there. Okta is used by my current employer, I log into the Okta portal and it has links out to all of the services it supports from there.
One of those things people who say "I don't understand why anyone uses Windows" don't understand. Something so pervasive and convenient that "we" the industry have given up in moving everything to the web, along with standard menus, ubiquitous keyboard accelerators for menus and dialog boxes, scripting with the likes of COM, ActiveX, AppleScript, or embedded Python/Lua, local snapshots or volume shadow copy, tools like DNSpy and AutoHotkey and SysExporter able to introspect into running programs and their windows and system controls (and they generally weren't obfuscated javascript inside), being able to see different programs in task switchers without them all being wrapped in a web browser.
It was a different and in many ways better world 10-15 years ago.