Because thinking up, designing, implementing, testing, refining 280+ perks was the lazy way instead of slapping on the old 1-100 and calling it done.
280 unique perks, or 280 lackluster perks? It really depends on what those perks are and whether they are actually good (or in this sense, well thought up) that makes them lazy or not.
Because revamping the way spells work, adding in different ways to cast like projectile, streaming, creating runes, etc was the lazy way to do it.
Spell making is different from the way in which spells are cast. I think you and I both know that but you didn't have a counter to what he said, so you completely veered off his point.
Because redesigning, implementing, testing, and coming up with all new skills/spells and effects was the lazy way to do it.
Refining and making skills better rather than giving them the ax because of inconvenience is the best approach.
Because making better looking armor and more armor varieties was the lazy way to do it.
They added more armor in oblivion within the expansion packs, so they could really do the same in Skyrim instead of combining it. Diversity does not entail the combining of armor, rather implementing different styles of armor.