I'll try to keep it simple while also constructive. I have been waiting several days (just started on on doing daily quests on Kumos recently) to give feedback. I tried to go in to the other threads to avoid posting about things that were already fixed. So, my apologies if I cover something that has been addressed already:

Thank You for...

• (Recently) making purchased quest items fade from low to high contrast. QoL on immediately seeing if I purchased something was not apparent, prior. I have a large monitor setups at home so it was also just hard to see all tiny at the top (even with the fade, it still is hard... a litte bit). Before the fade was just introduced, my impression was to suggest it be given a green background behind the item to make it glaringly obvious. But, this matters less so because quests cap at 2 items per request (less to keep track of).
• Reward breakdowns/how they are calculated. It initiates interest and makes me feel more emotionally satisfied after completing each one.
• The quest header giving a page link icon on the NPC's image to quick-navigate back.

Notes

• When I completed my very first quest on Kumos, it gave me a survey after completion but it covered up my rewards after instantly appearing. My survey feedback was inaccurate due to this.
• I'd love to see another survey in the future after I can hit quest rep caps or something.
• When I first started quests, I would see some items list "NPC Shop" and "User Shop" price. But, I initially expected the "Search All Shops" text to then give my individual shop pricing with the NPC shop listed first, like on Subeta. I now know to click it seperately but if I accidentally click it again in the future; it might be nice to list it again in the "Search All Shops" list that then results -just a QoL suggestion. I can train myself not to, but still find myself clicking "Search All Shops" every now and then while expecting the NPC shop to be listed first.