I don't know anything about this specific feature, but I can respond to the general question. All features have a maintenance cost. Additionally, the presence of features can add complexity which prevents other improvements from being possible. If we never removed any features we would eventually reach a situation where 100% of our time was spent on maintenance we could never make any improvements at all.
So a cost/benefit calculation has to be made, and features that are little-used or provide little benefit may be removed to free up resources.
I personally work on web platform APIs, and we sometimes remove features for security or privacy reasons. An example would be third-party cookies, which are very useful but have proven extremely detrimental to both user security and privacy.
Another reason why features are sometimes removed is aesthetics. For example, the "+" on the new tab button went missing for many years, although thankfully it is back now.