Dumbledore
Registered Users (C)
The minute you start using EAD for any job, your H1 status is voided.
You may resume your H1 status once you stop using EAD, thanks to "dual intent" of the H and L visa category.
Murthy's answer was correct, but I think she meant "to continue your employment-based immigration process" rather than "to maintain valid H1 status"
I do not know how you can 'resume' something that has been 'voided' (Probably you meant to say 'suspended', but I am not sure if suspension applies to any immigration status)
Yes, Murthy's answer does not give explicit affirmation as to retaining the H1-B status (that is why I quoted her without any interpretation), but I personally believe the questioner had maintaining the H1B status in his/her mind rather than the GC process and he/she got an affirmative answer. That is my judgement. I may be wrong. Since that was a chat session, I do not think we gain much by analysing word by word.
What I am trying to say here is, it is not a black and white issue to give instance verdicts like "One loses H1B status the minute EAD is used" (If it is that simple, it won't be a contentious issue at all). One must talk to a qualified attorney.
I earnestly hope some legal authority will issue a clear statement on this issue to put all the debate to rest.