I think that everyone should do what they like about editing photos they post here.
I haven't posted pictures or changed my avatar in a few years.
Since then, I have become a photography enthusiast and now use Lightroom5 and Photoshop Elements11 to edit the photos I take with my DSLR.
If I start posting photos here again and go very much beyond color balance/crop/straighten I will include a line in the post that I did so and might include before and after versions.