We can't just add different section for DeFi, yet they are belong to the altcoin discussion but we can have it in the future if DeFi project progressed their way and I'm supporting it.

But let us consider the fact that things may never look as it is now, the admins might just regret adding a separate section for DeFi and no one talks about it in the next couple of months.

DeFi is best on Altcoin discussion, you can create thread on that board.