A secondary monitor + viewer IS A MUST if you work with clients. If you do and you don't have a proper viewer then that client will change edit house to someone who has.
I have say that I don't agree with you that this is always the case.
My guess is that it varies, and that this is an opinion alone, which is fine. Other factors beyond this, such as the lack of editing or story telling abilities, rather than an external monitor may be more critical factors.
Perhaps you can provide us with what survey or study supports your view that you will always, mostly, or sometimes lose a client if a secondary monitor or viewer isn't available.
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