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It’s much better because it make it easier to line up caliper to the rotors, it reduce flex where you can hear rotors rub, I don’t need to worry about making sure the wheels is definitely 100% in the drop out.
Quick release still fine, the problem is that it’s not consistent meaning if you for instance use open cam quick release, it may not grip the fork end enough to prevent it from moving, which even on rims brakes can wear out a chainstay (very often with the older Cannondale SuperSix).
IMO, it’s less to go wrong, flat mount is not 100% great but because it’s now a standard, even MTB have flat mount now (XT and XTR), it make sense for rotors up to 160mm.
Is it though? QR fails on suspension forks and TA is the solution to this problem. All the other gains are marginal i would say, especially for road and gravel bikes. Or is cornering that much better on TA?