Do not trust anyone who tell you that this is normal. Running too many svchost.exe is not normal!!! I got plus 3-5 processe after windows wake up from sleep mode. After couples of wakeups I got windows 10 very slow!!!
After last update I can not decrease svchost.exe with setting SvcHostSplitThresholdInKB in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control.
From my experience less then 10 svchost.exe is normal.