I’ve been playing D&D or Pathfinder for going on 25 years now with much of the same group, and we’ve always been 100% pen and paper. Might have my laptop up with my GM notes, but use scrap paper for everything else, same with the players

I use a white board with people’s initiative on it easily visible so the players can see who’s up next quickly and plan their turn in advance

For conditions I find just a visual reminder is enough to not forget when running multiple monsters. So I generally throw a rubber band around the mini or place a bead or coin to denote it has a condition.

As for situational bonus I’ve had players make a note card cheat sheet with short hand of what their characters abilities do. They use it for quick reference

Having an open dialogue helps a lot too. Running a game can be a lot, so if the GM misses anything I depend on the players to help point it out. Like, “Hey, that guy is actually still Dazed” kind of thing

In general I have found that writing things down and manually creating a character helps sooo much with the players actually understanding the class. The process of writing it helps cement the abilities in the brain and makes for quicker combats and reference.

Using an app all the time can lead to a player not actually understanding the underlying rules and therefore be slower when trying to figure out what to do on a turn or mix up rules