It never really had detection issues unless you count the very first versions for Windows XP https://www.av-test.org/en/antivirus/business-windows-client...

And for many things WD is simply much better than any solution this includes offline removal of rootkits (it can boot into a WinPE environment for a scan) and Ransomware protection where Windows Defender can restrict apps from accessing folders that tend to keep user data: https://cloudblogs.microsoft.com/microsoftsecure/2017/10/23/...

Basically if you have Windows 7, 8 or 10 keep Windows Defender on it actually does work.