Minecarts should be used for their original purpose of mining

Minecarts were added to Minecraft to help with mining but nobody uses them that way. They are usually just used in complicated Redstone contraptions and in moving entities like villagers from place to place aboveground. Minecarts should be changed so that people would find it worth it, to use them in mining.

They could have a special boost when underground like they go a bit faster or the loud sounds scare hostile mobs away from you. Minecarts already have a very unknown mechanic where if they get pushed together they link until they move too fast or turn a corner but maybe minecarts could be changed like the ones in the Quark mod where they can be linked with chains and will stay together until the chains are removed. Maybe their could be a minecart type that replaces broke or missing rails that could be used in abandoned mineshafts or just through caves to help you explore without placing rails yourself. It would make it so you don't need to manually direct where a TNT minecart explodes. It would be useful if hopper minecarts and TNT minecarts were sort of a team so you can link them with chains and when a tnt minecart explodes, the hopper minecart collects the materials and turns around. Minecarts could turn around when facing a big hole like the hole that a TNT minecart makes.

There could also be different minecart types and furnace minecarts could have a bigger reason to be used but I am running close to my word limit. I think my type of changes would improve minecarts.