It definitely looks bad, but I've seen a few videos demonstrating the issue and it only really happens if you have the joycon entirely covered by your hands, or behind your back.
This could be a software bug that is fixable with an update, but that seems unlikely considering it affects the left controller more than the right one, which would indicate a hardware design flaw.
I'm not following your train of logic where it isn't that bad if a joycon doesn't work if covered by your hands. For a real product it needs to work in all cases, not if you put your hands a certain way.
This could be a software bug that is fixable with an update, but that seems unlikely considering it affects the left controller more than the right one, which would indicate a hardware design flaw.