I agree with some points, especially with the time frame. Sometimes traditional A/B tests take too long. Global design changes, new product launches, brand refreshing, or new information architecture are more important.
On the other hand, doing A/B tests for small changes can also have a significant impact on your overall results. I think doing A/B tests is better than not doing them at all.
Please don't use url shorteners as it obscures the destination URL. Also, preferred practice is to just some the URL as a normal submission. If you have something to add, do it in a comment on the submission.