Is Best Buy essential? No? What if my laptop breaks and I relied on it to work remotely?
Are electricians or climate control technicians essential? What if the air conditioning breaks in the middle of a texas summer? How can I self-isolate when it's even hotter inside than outside? What about elderly people who could easily have a heat stroke?
Are psychologists essential workers? They might be even more essential now that so many people are facing complete isolation and job loss.
For a week or two sure essential is very narrow, but after several weeks that can expand.
I will say though, my state at least deemed most of the roles you mentioned essential. I can still get my computer repaired, get construction/maintenance done, and at least consult with my medical professionals over the phone/video chat for now in terms of basic consultation. I know betterhelp.com is a service (there are others) my spouse has used.