I have to agree very strongly with the comic ceiling point. The way Tapas is built has led to a certain handful of comics that are super popular and remain popular simply for being popular . . . so they end up being the only ones seen at all times, which just continues to fuel them with minimal effort. Additionally, because of the growing traffic of the website, and the increasing number of readers, it takes a lot more now to break into Popular/Trending. When you add in the fact that getting into those sections requires you to compete with those popular comics mentioned, it's become unnecessarily difficult.
Three years ago, it would take maybe 500 views to get into Trending/Popular; now it takes a few thousand, views that most people just don't get because there are comics that automatically get those views from constantly being in Popular, Trending, Daily Snack, and just featured all the time via banners and other things here and there (plus the genre matters too - I hate to bring it back to this argument, but yes, gag-a-day and BL are basically the prerequisite genre to making it anywhere on Tapas, especially if you want to break through that comic ceiling that's been formed as a direct result of these genres).
Tapas is gonna grow, and that's just an inevitability. It's not a bad thing. But the way the site is built basically means that the more it grows, the less variability you see in content - because all that traffic is being redirected to the same small handful of comics over and over again, from every possible angle.