Does ETTR ( Exposing to the Right ) provide any benefit while shooting in JPG ? Or is it only beneficial when shooting RAW?

As far as I am concerned, no, because ETTR will require post-processing, and global color adjustments on 8-bit/channel images entails color loss. So you have better get the JPEG as correctly exposed as possible.

It depends on whether you are planning to postprocess, like lifting shadows or other contrast adjustments. JPEG compression relies on throwing image information away that it considers indistinguishable to the viewer. If you postprocess in a manner that makes stuff more visible, JPEG compression may already have thrown away what it thinks you don't need. An ETTR JPEG will for that reason usually take up more disk space than a normally exposed JPEG, and creating your final product by toning the ETTR JPEG down rather than raising portions of the normally exposed image will work better.

So if you are going to postprocess in any manner, the benefits of ETTR are larger than even with raw processing, because of JPEG processing. Of course using raw with ETTR will still be better.

If someone is getting the results they want without deliberately Exposing to the Right, I am not sure why they would change. But anyway…

The math is the same. Bits are bits. Having fewer in a jpg file doesn’t change that.

The most significant bit always carries twice as much information as the less significant bits. The high bit of an eight bit jpg channel carries 128 values, or half the 256 possible values for red, green, or blue.

None of this means you should expose to the right.

Whether you shoot jpg or RAW, the best exposure is proper exposure. Proper exposure means that you are not fixing errors in post.

Exposure to the right is not the same thing as proper exposure.

Proper exposure is a matter of intent not a case of applying a rule. Proper exposure is about making the picture you intend not deciding on the best it-looks-ok later.

If you are happy with the way your jpgs are turning out, why would you want to change what is not broken?

If you are exposing to the right by increasing the amount of light collected (AP/SS) then you are maximizing the amount of light collected, and maximizing the amount of data/information for generating the picture (and increases recorded dynamic range).

If you are applying higher ISO (ITTR), then no...there is no real benefit as ISO is not exposure/information (reduces recorded DR/data).

If you are exposing to the right by pulling the exposure (actually ETTL) in order to save highlights, then it is a tradeoff... recorded data/DR remains the same, it just changes which end is where the loss/clipping occurs.

Jpeg or raw doesn't really make any difference...