Incenjucar
Legend
At level 6 we saved an entire Drow civilization from a Lucodemon invasion, travelled to another world, flew around, managed armies, ...you can't even do 1/2 the things we did until epic in 4e, if that.
This is perfectly doable in 4E. My group just hit level 9 and we've been doing this sort of thing for awhile. Don't confuse DM inflexibility with game inflexibility.
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I actually had a discussion about the CB with a WotC representative the other day. He seemed to have been convinced that 20 characters is all you'll ever need. I reminded him that people like to do experimental builds and to pre-build characters from 1-30. He suggested that you could just print them to PDF. I asked him what, then, the use of an online CB was, if you had to print things to PDF onto your PC. By the lack of real answer, I think I got my point across.
Hopefully people are communicating their concerns to WotC directly through email, with polite and clear examples of how the limitations affect them. WotC employees naturally experience 4E in a different way than non-employees, so they need help getting information like this.