I do understand the whole concept of mixers and I have always wondered why that. If there is nothing to hide, why will I go through the risk of losing my Bitcoin if I might not get them back? Coming back to your statement, you do understand that has been the problem with Bitcoin transactions or Crypto in general, how many places can we spend crypto for now or how easy can you find someone that you can trade in exchange for goods/services? even after using the DEX, you still need the bank at least for now may be it might change in the future.
There's always a thing someone need to hide, will you feel safe if you share your total assets, where the assets you have, how to access it and your home location to stranger like me?
Yeah there's a chance you can get scammed trading via P2P either in site or directly trade, this is why you need to trust the person you wanted to trade if you trade big amount money. Well there are many ways to receive your money, not only through bank account.