About as likely as something like a druid lightning DD.
I mean.. on live I had npcs resist root if they were something like an in town guard or something innately magic resist. All blue cons are not created equal
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But absolutely I'd go to PK a geared player and have HT partials/resists as commonly as casting a magic nuke on them from another class.
We leveled our SK twinks on Guard Reskin/Tolus and Travis Two Tone. They'd resist the occasional HT (not commonly) but it was usually saved for PvP.
"Your target resisted the harm touch spell" is absolutely burned into my memory fighting a yellow con skeleton in Nek on a PK twink (FS 2hander troll + darkwood cam2 bow)