How 'bout you quit talking out of your ass and read the facts? I even linked them for you, so it's not like you don't have it easily accessable.
By the very basis of interlace vs progressive scan, all progressive scan resolutions are visually twice as good as their interlaced counterparts.
They are not considered the same resolution. They do NOT have the same "base resolution". They have the same initial image, but the resolution itself is VERY different. If they were the same, all TVs capable of displaying a 480i picture would be capable of displaying a 480p image. Pure pixel-count isn't the only part of resolution.
And, actually, as I read more, I've learned that 480p usually has 80 more horizontal pixels (720x480 as opposed to 640x480. NTSC vs VGA resolutions).
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