I think the growth of Discord partially explains it- They needed a _lot_ more SRE/Scale engineers, which causes growth in HR/Management layers.

They also added a bunch of monetization stuff (discord nitro) and attempted to get more "community" based features like custom emotes/badges/profiles per server/watch party stuff.

The core experience is the same, I think they've done a great job ensuring that doesnt change! They have also done the usual software stuff, improving core outskirts like stability/performance/login methods/slash options. Its the same core product but better.