There's no way the 3 4E core books on release could contain the info to match 2 PHBs, 7 official splat books, 3 3.5 monstrous manuals, the "Races of ..." books, and whatever else campaign material was used for peoples 3.5E games. That's impossible
Yes but we made our characters using only the core 3.5 books. I said ninja, what I meant is multiclass fighter/rogue. 4e had plenty of new stuff in its initial core books, but the cost of adding that new stuff was that it had no room for old stuff which people already liked, like the druid, sorceror, and proper rules for multi-classing.
I'd prefer it if the 5e core books focus on doing all the stuff that already exists well, and leave any new stuff for later publishing.