The Original Trilogy is no more perfect than anything else. The same criticisms often leveled at other Star Wars movies can also be applied to the OT. Since we’re in the habit of forgiving and overlooking, why not spread that attitude over all of Star Wars?
No one here will suggest that the OT doesn’t have flaws. What matters is the amount and severity of those flaws. I don’t ignore flaws outright, but the OT are solid enough films that the occasional flaws don’t detract from the experience, and I’d argue that they are “closer to perfect” overall. Other Star Wars films, however, are more flawed on a fundamental level that takes you out of the movie. Too many problems on a structural level start to add up until the film appears broken under scrutiny.