Stack Exchange sites have a little-known feature: if you type in a number of four or more digits into the search box, and the number happens to be the ID of a non-deleted question (not answer), you will be redirected to the question with that ID.
This feature has been in place since 2009. Attitudes towards the feature have changed quite a bit over the years, as indicated by a 2010 feature request to add this redirection (it already existed), versus an employee commenting in 2017 that this is a "useless feature".
Personally, I find this feature a bit irksome. For instance, searching for "1040" on Personal Finance and Money, I (as an American) expect to be searching for questions about the income tax form 1040, but I'm redirected to money.stackexchange.com/questions/1040. Similarly, when searching for "3000" here on MSE, I was expecting for it to provide me some search results to lead me to Anyone with a "visited: 3000 days, 3000 consecutive" in his/her profile? (before its title was edited), not to go to meta.stackexchange.com/questions/3000.
Plus, the vast majority of users do not have the ID of a question memorized (10k-only).
What should be done with this feature? Would you support the feature request from 2010, or the comment from 2017?