This is definitely a low priority topic, but would it be possible to provide a visual cue concerning the size of the discard pile?
I am aware that the rules say "A player is allowed to count how many cards are left in his Deck, but not in his Discard pile.", so I understand that the current implementation reflects that and having a counter as on the deck would be in violation of the rules. I have to admit I don't fully understand the motivation for the rule - I found a comment on f.ds that this was because counting the cards would lead to examining them, as they are face up, which is irrelevant online as the game does the counting; and the information might be critical at the end of a Gardens game, which is rendered moot by the VP counter. If there is no other motivation, I don't think a counter on the discard pile would hurt, but I don't want to start another rules discussion if that would be considered variant territory.
However, in a real-life game you do have a feel for the size of the discard pile. Visual inspection allows you to distinguish whether you have 1 card, 10 cards, 20 cards, or 30 cards in there. So having a visual indication of approximate discard pile size would in fact make the online experience more similar to the tabletop game, if that is the primary goal. You might argue that a competent player should have an idea whether there are 5 or 30 cards in the pile, which is certainly true, but having no information on this at all is still quite different from real life and does not feel intuitive. E.g. in one game with heavy Forager trashing, I overtrashed in a way that I don't think would have happened to me with physical cards.
If a counter is not acceptable, and visually indicating stack size is too complicated to implement, maybe an approximate counter in steps of 5 or 10 would be acceptable? That would be something completely new, though.