Don't get your panties in a wad... And remember what thread you're in.
If 3 lugs in a circular pattern are not better at equally distributing pressure around a round object and keeping things more aligned under said pressure, why do we use a 3-lug design for suppressor mounts, instead of a horizontal 2 lug? If 3 lugs were not better than 2 lug designs, then why is pretty much every action now a 3 lug, other than a select few? It's obviously better, or everyone would still be using 2-lugs they always were prior to the Browning A-Bolt coming out back in the day...
Also, the integral full-length top rail does increase rigidity and strength along the backbone of the action. While a bolted-on rail does help noticeably, it is still not as rigid and strong as an integral. This applies to more than just actions. This is common machinist and fabrication knowledge.