yeahs, the offline caching got terrible. its text that (rarely) changes. I have no idea why the mobile app couldn't just remember what each url was, even if it was 6 weeks stale.
Also, Pocket couldn't create reader views for many websites (like hacker news discussions), which means the TTS was useless.
Oh and the TTS required an internet connection.
Something did change maybe about year and a half ago about rendering articles. It felt like less and less of them were rendering in article mode, and I needed wifi access to read articles in the original format. Before that practically everything rendered in article mode, afterwards I would say it was about 50%.