I've seen videos where people find that aperture setting of 2 or 4 results in the sharpest image on the drone. But if we look at photography, smaller aperture results in narrow depth of field. Wouldn't you want to have a higher aperture setting when filming scenery so you have a wider depth of field? Or else the surrounding will get out of focus right?

It’s a balance of DOF and sharpness , to small an aperture can result in a softening of th3 image, many thing somewhere around 5.6 is where M2 is sharpest, but try a few different things yourself and work out what you like best .

You can disregard DOF thoughts on a 28mm lens being airborne and at greater distance. Even with wide open f-stop.
Unless you film apples on a tree very close-up :-)

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It's not an issue on the Mavic 2 Pro.

Its got a tiny sensor (1" is tiny).

Ultimately that means even at f/2.8 unless you're REALLY close to the subject (a few feet) everything is going to be infinity focus anyway.

You can run the numbers here to prove a point:-

https://www.cambridgeincolour.com/tutorials/dof-calculator.htm

Using 10.26mm lens, f/2.8 lens and a 1" sensor it shows any object focus distance greater than 3.5m is infinity focus.

In reality of the drone you're very unlikely to be shooting things, especially landscapes within 3.5m of a subject so basically everything is in focus.
Therefore, depth of field and blurring are not an issue with a Mavic 2.  Despite what people claim above, DoF simply doesnt exist on a sensor this small in the sky.

You need to remember although this is a big sensor for a *drone*, its a tiny sensor for a camera in general.

On the Mavic Pro 2 is ƒ5.6 the sweet spot before diffraction limit effects start to surface?

Its roughly even sharpness f/2.8 to f/4.

At 5.6 diffraction stats to show, at f/8 its unusable.

Agree with the comment above. F/2.8 to f/4 are the sharpest apertures.

What the majority of people commenting here forget is the crop factor (2.7x) that needs to be applied to the 1” sensor. To be precise, the effective aperture needs to be converted to its 35mm equivalent to understand the real depth of field. That’s the reason why smaller sensors deliver greater depth of field.

To be more specific, f/2.8 (x 2.7) = f/8 approximately.
f/4 = f/11
f/5.6 = f/15. Diffraction slowly creeps in. Very few lenses are sharper at this aperture, mainly macros.
f/7 (= f/19) and above is a no go.

And that also explains why people though that the MP2 was very soft at f/11 (= f/30!)