Search engines (or one at least) truncates the description at 160. The advised size is between 150 and 160 so no need to force a smaller size. It's a good idea to keep it at 155 but larger sizes should be allowed. cf: https://moz.com/learn/seo/meta-description We could fully remove the limit as there is corner cases where a longer size is used (https://moz.com/blog/i-cant-drive-155-meta-descriptions-in-2015) but this should be in addition with an indication for the user of the current size and the advised size.