This will not be happening, although it is suggested a lot of times. I'll explain another time:
When trading would be a thing, multiple things would/could happen that people dont want to happen:
- Multi-accounting: Using other accounts to get advantages, as they could produce more stuff, which results in more coins
- Cheating challenges: The point of the challenge version of SkyBlock is that you can only get further in the game by completing challenges, which are ridiculous tasks. If you could simply get stuff for a challenge because someone else doesn't need them anymore (because they completed that challenge already for example), the whole point of this version of SkyBlock is ruined
The game would lose its concept completely with a trading system, which is why I disagree with you