If you made even a passing attempt at understanding this space you would see how wrong you are.

Anyone can interact with a contract directly, you don't need any FE or BE at all.

I can't speak to the specifics of dydx since I am not a user and haven't done my due diligence on them, but with every other dex I have ever interacted with it is entirely possible to use their service entirely from the contract interface.

Its usually the first thing I do to ensure that I can access my funds without any external dependencies.

How can I make a passing attempt to understand the space when I've already been teaching decentralised tech for 6 years

Then as an educator you are doing your students a disservice and allowing your personal bias to impact their future.

You are just contradicting the parents comments while trying to claim they aren't being misleading. The exchange when down with aws and they were lying about being decentralised to sell tokens