It does seem like Tabletopia simulates having the game in real life, but without the convenience of using your actual hands that you are used using. This only really seems appealing once VR has market saturation, so that you can actually meet with distant friends over a game of codex.
The purpose of a digital version should not just be online play. It should be simpler play that handles a lot of the mess for you, so you’re less likely to do something illegal accidentally, and that presents all the info you need efficiently. (The spreadsheet is a great step, because I’m much better at discarding and drawing properly when pressing a “discard/draw” button than when actually using two face-down piles.)
Dominion had a great fan-made, rules-enforced, text-based version on Isotropic using movie stills to replace the card art. It was super-pared-down, and games were clear and fast. Donald X only let it last until the official version came out (and apparently the creator had no desire for Isotropic to become the official version). I quit playing online not because of paywalls, but because by making the official version much prettier, it was much slower and clunkier, and it lacked most of the sets on release because they were so behind. (And it was buggy.)
The only full-art rules enforced digital card game I’ve really liked was Yomi, though I’ve heard the Xbox versions of Uno and Jungle Speed were good. But they’re all relatively simple compared to something like Dominion or Codex. The more complex a game gets, the more simplified the digital version should be (to summarize the work of a physical version), and Tabletopia is the opposite.