The last major update was in 2017, bots started plaguing casual mode around 2018/19, and ever since the game has seen anastonishingly tiny amount of updates outside ofhthe usual summer, Halloween and Christmas updates (which just shove community made content from the Workshop into special gamemodes and crates); apart from the recent 64-bit version and the VScript addition a while back, nothing of interest has happened in the last handful of years. F2P lost their ability to call medic and the bot crisis is completely unsolved.
It's sad. But as another user pointed out, at least we have e community servers (and good ones).
Yes!! Mordin's arc is beautiful <3