(please note i dont know if someone suggested this already)
it would be amazing if the minecarts connected so other minecarts would be more useful
like minecart + furnace or minecart + chest
Not sure if this is a request for https://minecraft.gamepedia.com/Minecart_with_Furnace & https://minecraft.gamepedia.com/Minecart_with_Chest (already in game) [ie. a late AFJ]
or something more along the lines of the various train connected mincart or train suggestions eg. https://www.minecraftforum.net/forums/minecraft-java-edition/suggestions/2881762-linked-minecarts
More fully developing the request would be helpful....
WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.