Some market board QoL would be great, but anti-undercutting measures are futile.
Crafting is extremely easy now. Gathering is even easier. This also creates a situation where more players can be self-sufficient. So now there's an abundance of crafted goods for sale, but very few buyers because most people can make their own.
The reason your items aren't selling is because they're worthless. Hardly anyone wants them and thousands of people want to sell the same thing. No, there's no point in looking at the market history and rambling about how "it was selling consistently for 100k and some idiot crashed the price to 50k!", because if one person undercutting could kill an entire market, that market was extremely fragile and hanging by a thread at 100k and you just got lucky for a while. Your item was never "worth 100k". It's worthless.