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For security reasons alone.
... because all the data that 'linked' the Steam client to your account would then been erased by the full reset / re-install.
So no worries.
(edit)
Also: the option is "Trust this maschine" but it actually means "trust this client" which can either be the Steam client or one of your browsers. I use multiple browsers on my machine and well... if I authenticate myself using Opera then Edge is none the wiser about that.
Then again, I'd rather keep the hard drive and put a new one in the pc I'm selling.
And, yes, I never sell a computer of mine with the hard drive. It stays with me. I don't even sell or relinquish my old cell phones.
Or do a secure format from command prompt. Each pass will wipe the drive and flood it with random data. Just change the x to how many passes it should do. Preferably 2 at a minimum
format c: /c:x
All you need to do is exactly what you would do for bank accounts and any other account based stuff on your PC - WIPE IT.
that's all I can think of. Also you want to reauthenticate stuff with a newer steam guard permission anyway.