The people that didn't care about proper color management before aren't going to care about it now, and the people that did care about it before still care about it now. I would agree that FCP 10 + a decent calibrated monitor is more color accurate than FCP 7 + a crappy monitor but how useful is an apples to dog crap comparison?
I did the whole ghetto multi-cam thing for years and I'd rather not revisit those days.
I can only judge FCP 10 based on what it is right now. Like I said before, if FCP 10 grows into something that I think will meet my needs I'll put it back in my tool box. I need tools that I can use today, not tools I might be able to use sometime next year.
Cheaper than buying FCS 3? Yes. Better value? Not by a long shot. One could also buy CS 5.5 or Avid MC 5.5 at the discount price and get a much more well rounded solution for about the same price as FCS 10, Motion, Compressor, and the proper Automatic Duck plugin.
Backward compatibility is a big selling point to keep people from venturing else where. Post houses have archives of old projects, TV shows have past seasons that will inevitably be pulled out of the mouth balls, and longer term projects like documentaries (a stronghold of the old FCP) can takes years to complete. For example, I recently finished a documentary that spanned FCP 5, 6 and 7!
I'd rather have tape support and not need it than need tape support and not have it. Avid and Adobe currently have more tapeless support than FCP 10 does and they didn't ditch tape I/O to get it. It's not an either/or problem.
Using tracks to organize the timeline, especially in a multi-editor environment, is a simple and common way to keep things from turning into a visual clusterf*ck. Think of it kinda like white space when it comes to formatting text. I'm also not a fan of the magnetic timeline for similar reasons (it doesn't let me organize and manipulate the timeline how I want to).
One of the things that made FCP 'classic' so popular was its flexibility. Sure, if you didn't know what you were doing the program would give you enough rope to hang yourself with but if you took the time to read the manual and had some fundamental video knowledge you could certainly get the app to 'punch above its weight'.
Lethal