This happens every other 5 levels so you won’t experience this until AR25. So you can actually overcap your AR experience which was shown by a lot of posts asking why this was the case. So as long as you don’t complete the ascension quest your world level will never increase so don’t hurt yourself by slowing down.
Or just do them before you go up. Imo it's worth it because there's literal to no difference in enemy damage, but you will notice an increase in enemy drop rates (normal enemies, not bosses). Boss drop rates remain low as crap even at WL8, but at least you are guaranteed one 5* artifact per boss run at AR55. TLDR, no point hesitating, just doMoreover you can probably cap the ascension level for lower world level to prevent overkill. Another benefit to this is that the game becomes more beginner friendly and thus allow more casual playthroughs where players can play for the story. The writing in Genshin Impact is fantastic and thus make players fall in love with the characters.
If that happens in a weekly boss challenge, then players might have to swallow their pride and lower the World Level. RELATED: Genshin Impact: Side Quests You Missed In The Inazuma 2.0 Update. What I meant to say is that the rewards are based on the Host's World Level. So seeing as he's hosting and is a lower WL, you'll get rewards based on that world since that's where you're initiating the event from. If you host, you should get your WL rewards and I think he will get a higher WL reward as well. Only way to find out is to test it. qbOX.