They did a good job adjusting difficulty for f2p. Case in point one popular streamer finished spiral abyss with just the free handout characters they get, not even enough to fill the 8 slots. I think the primo geovishap vs shield mechanism is something I'd say would be interesting to explore further as well as other things that doesn't rely on pure dps. That's extra damage just for putting up the right shield at the right time and it doesn't factor your characters' stats. It would really be interesting if they use more mechanics like that. Your friend may not have noticed it, but you can see which elements the weekly boss has by looking at the the symbols/colors next to the entrance. You can easily set up your team based on that. Zhongli was decent before, but he is literally unkillable now post-buffs. While it's nice, I don't think he needs that much extra power.