Expert mode to me is a bit of a drag without any worthwhile rewards. I suppose the Suspicious Looking Tentacle is bright and helpful, but otherwise you're mostly just playing it for the purpose of playing it. People like challenges, which is fine; expert mode is more suited for a group of players who don't want to steamroll the whole game.
I do appreciate that most of the expert-exclusive items are not necessarily class-specific and can be helpful to anyone (an early form of mobility, a crutch for those high damage numbers, another accessory slot, a faster minecart, and so on). But in the long run, most of it isn't worth keeping, but I suppose that makes sense, since not all items in the game are going to be helpful forever. I don't even use the Worm Scarf on my characters because I'd rather have something like more damage or mobility. But I'd still like to see more expert rewards in the future so there's a bigger incentive.
I also don't like how defense has been made nearly useless in expert, making percent-damage-reduction items the go-to choices. I don't mind the percent reduction, but why nerf defense? Yes, it was made to be slightly more effective, but the increase in enemy damage outweighs it significantly. It's a little better to just build into damage and criticals instead of defense, but I suppose "experts" don't need to rely on defense. My character with 100 defense should not be taking more than 100 damage from a simple Moon Lord projectile. If only boss banners existed...
Either way, I play Terraria to have fun, not to win. So expert mode is annoying in many cases and seldom rewarding, with the exception of when I finally punch Plantera in the face for being way too fast and strong and forcing me to dig a stupidly oversized arena.
Regardless of normal or expert, I still just turtle at the Nurse for the Moon Lord, but that's a whole other can of worms.
I may be considered a scrub for preferring to play normal mode, but I always make each playthrough challenging in some way, like limiting myself to certain weapons of my liking. That to me, is my personal expert mode; still the same Terraria I've grown to love, with my own challenging spin. I talk too much.