As far as Petrucci's lead tone changing over the years, and how Beato asked him about that, I would've asked him if he felt it all came down to the gear, or if any part of it has to do with his playing. Because it sounds to me like it does.
His licks have always been amazing and tight, but the last several years, they actually sound like they have a liquid quality. The individual picked notes have absolutely no space between them, sounding almost like they're legato.
Like in this solo. I'm hearing a striving for 'liquid perfection', and continued refinement of his technique. Not just pushing the gear.
Some may think it's too perfect. I hear a man who is always pushing himself to be an even better player than he was on the previous album. I'm the kind of guy who looks up to, and respects that.