Not it is not, because obscurity usually assumes human limitations on information gathering and searching. So that layer that would bin a human to search for a life-time is non-existent for a proper machine search. The hidden folder, in a sea of thousand folders is not hidden for a machine.
Obscurity was a valid layer, while we did not have machines to eliminate it. Now its gone, and remains a lingering illusions, created by our own limitations.
There is still the fact that a number of automated vulnerability scanners still check for common/default configurations. By not conforming to these patterns, at the very least you are less likely to be subject to bots just trolling for systems easy to compromise.
Obscurity was a valid layer, while we did not have machines to eliminate it. Now its gone, and remains a lingering illusions, created by our own limitations.