Display URL (Google Parity) - Allow more than 35 Characters to be entered in the system and then just shorten the ad with "..." like Google
Bing needs to follow Google's lead and allow for more characters to be inserted into the display URL field and then visually change how it looks on the ad instead of just not letting you enter more characters (especially when it still requires a top-level domain like .com in the URL). With the current setup, advertisers are required to shorten the display URL which confuses the customer and could impact quality score.
Tejas Gowda, Program Manager, Bing Ads commented
Thanks for your suggestion. We have started looking at supporting this. We will keep you posted.
Taking it a step further.... Have a manual review process for advertisers with root domains longer than the 35 character limit. Just had to tell a client they had to change their domain (which they will not do) or they cannot advertise. Their domain has 36 characters. With Adwords, Google was able to manually approve the ads with the extra character.