I used to download Offline symbol packages (Debug symbol MSIs) and use only them since it's we don't need to wait for slow downloading as we go in debugging. However this feature is no longer existing starting with Windows 10 1803/build 17134 (Features removed).
How can I fetch all of them once and for all ?
Run this command to get all PDBs for all Windows files:
"C:\Program Files (x86)\Windows Kits\10\Debuggers\x86\symchk.exe" /r c:\windows /s SRV*c:\symbols\*http://msdl.microsoft.com/download/symbols