I blame rent-seeking academic "publishers" for the lack of these features. There are multiple high-impact features to be built in this regard, many of which would take an experienced dev around an afternoon to build, if a proper data source existed.

Instead, the only way to access many papers is as an idiosyncratic PDF, often only including a post-hoc OCR layer, and of course locked behind a 49.99$ 24-hour-access paywall that can also not be automatically accessed, even if you had the required millions laying around.