Exactly mate I agree absolutely with you and no matter how we paint it, the middle men which are the exchanges are in one way or the other inevitable and I've always seen several threads preaching against exchanges and after closer observations, I noticed that what they reay preach against is storing on those exchanges and not trading on them.
Over the years, exchanges have made transacting with bitcoin and cryptocurrencies in general much more easier and even more secure through their escrow services and at the end, crypto is traded for fiat in cases where bitcoin isn't accepted and one of the safest way to do this is through P2P on exchanges.
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The concept of the middle man is an interesting topic in the study of economics, because of the argument about their relevance in business transactions. Some sees them as blessings, important intermediaries that makes transactions easy and convenient, while others sees than as an unavoidable evil, that you call to interferer, they reap and grow fat from other people's business dealings. Anyhow you look at it, whether you like them or not, they perform the important tasks of exchanges.
Because bitcoin P2P transactions are not one hundred percent reliable, especially when you're transacting with people that you don't know, using trusted exchanges becomes important because they guarantee peace of mind that most probably you won't be scammed.