You can sell in bulk. I think its 8 cards atm. Thats still a major pain in the ass.
I pulled my hair out waiting for the transaction to complete today. The reason i wrote this. Im a crypto enthusiast, gamer, i played LoL to diamond league, Splinterlands to diamond every week almost, i hold crypto, i know crypto, I played Vanilla Wow, you can slap me around with BS all day long but i wanted to pull my hair out when having to relist 2 cards today.
You can hardly expect any normal player to do the same. They would just middle finger everything and move on.
Yes, imagine you want to sell 30 different cards and at the moment you place them someone undercuts your price and you effectively lose a lot in transaction fees. That is not sustainable.