Atomic swaps are fantastic, but BarterDEX isn't for regular users yet, it works on utxo level, and it's confusing to learn after years of using a centralised order books.
They're targeting the top 1% of high end users who want maximum privacy (no kyc), with no arbitrary limits, and 100% security.
If you're happy to do KYC selfies on regulated exchanges like polo & bittrex you wont ever use BarterDEX, it's a niche service.
I would agree 100%, BarterDEX offers a niche product that's not easy to use yet, but for XMR hodlers who are privacy conscious it makes sense to use a privacy based exchange, if/when BarterDEX adds xmr support. Not much point using private xmr if the fiat exit/entry points are stockpiling user information, might as well use secure private exchanges too, especially if you're a whale. Until it's possible to use xmr for majority of day-to-day transactions, people need to use fiat, and noobies need to buy xmr in the first place, and with centralised exchanges needing to be kyc compliant, the safe option is using privacy oriented exchanges.