I've yet to see any factual information supporting the benefits of barrel break-in and/or cleaning after every shot... People swear by it and others ignore it.
While I would tend to agree, the 700 action is perfectly fine. And I'm not too sure about the Howa/M70 having better receivers/bolt/extractors either. There's a reason a lot of guys build off the 700 action and significantly fewer guys choose the Howa/M70 to build off of...
The claw type extractor is definitely superior to the remington extractor which is why so many customs will have a SAKO or M16 extractor added.
You will never see a failure of the claw type extractor unless the case is stuck so badly it has to be hammered out unless someone has bent the hell out of the extractor with a screw driver or other wise.
The reason the 700 is so popular just goes back to the marketing of the sixties, seventies, and eighties and a couple of really bone headed decisions by Winchester in the sixties, namely trying to save money by going to a bolt without the claw type extractor.
Gunsmiths prefer the 700 action largely because that's what most are trained on and have their equipment set up for along with not having to cut the big extractor notch in the barrel for the claw type extractor.
I own almost as many 700's as I do M70's and given a choice I'll pick up an M70 every time.
You also have a much better factory trigger with the M70 than Any of the Remingtons that have been produced in the modern era along with the 3 position safety which is also superior to Remington's.
I find the modern controlled round feed to be superior to the push feed as well for a number of reasons not the least of which is that the round enters the chamber in exactly the same manner every time.
I also very much prefer the integral recoil lug built into the M70 vs the Remington style.
Lastly the Remington has the advantage of vast aftermarket parts availability which is good until you look at why that aftermarket exists. It exists because there is so much that can be improved upon over the factory original parts.