Pixel peeping is the photographic version of standing six centimeters from a painting and complaining about the brush strokes.
It can be useful.
It can also become completely stupid.
Sharpness Is Contextual
A photograph intended for a large print has different requirements from one viewed on a phone.
A wildlife photograph cropped heavily has different requirements from a street photograph.
There is no universal definition of "sharp enough."
Cameras Are Better Than We Need
Modern cameras produce enormous files.
That does not mean every photograph needs to survive a forensic investigation at 400 percent magnification.
At normal viewing distance, composition, light and subject matter usually matter much more than whether one feather has microscopic detail.
Test the Final Image
If you are worried about sharpness, inspect the photograph at the size it will actually be used.
Print it.
Put it on the website.
Look at it on a phone.
The final output is what matters.
What Actually Matters
Pixel peeping is useful when diagnosing a technical problem.
It becomes pointless when the technical problem has no visible impact on the finished photograph.
Do not optimize the pixels.
Optimize the photograph.