Everything is "acceptable’’ … after all it’s only a hobby and you can do whatever you want.
BUT I don’t understand why someone believe that its something I would recommend or think is effective. I don’t and would not do it myself or have clients do it.
When specializing on 1-2 muscles I normally have people train these muscles 3x a week and the rest of the body is done at maintenance level spread over 1 or 2 days.
You CAN do a small amount of work for a specialized muscle every day, but not stopping training everything else completly.