More or less. To some degree it's a comfort issue. The key is to be able to move in any direction at any time without losing balance or the ability to punch.
As far as "fighting in arcs go" here's what I mean. If you saw the Berto-Ortiz fight when they were enaging it looked like a fencing match. Just moving back and forth on the same line. No lateral movement. it makes one extremely predictable. By fighting in an arc I mean you don't want your head opposite the other guys head in a straight line very often. You want your had changing it's position relative to the other guys head. Sometimes opposite his right shoulder, sometimes oppsite his left shoulder, sometimes outside each and always changing. Does that make sense? it makes one harder to find and tougher to figure where the punches are coming from.
Here's an exxagerated example that really speaks only to the offensive element. It is the very end of the Marciano-Louis fight. Watch how Marciano's feet are ALWAYS moving and how his head keeps popping up in different places around Louis' body. Left shoulder, right shoulder, way outside etc. Rocky is doing a gazillion things technically wrong in this 30 seconds, but he is fighting in arcs and it lets him dictate the action and every punch he throws at Louis is coming from a different direction than the last one did.
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