That's like saying paper money has a design flaw, or ethernet has design flaws because it doesn't account for serving web pages.

Or its like saying an automobile has a design flaw because it can't go in reverse.

How is it at all the same thing? Bitcoin isn't a contained technology, it can be built on top of just as the internet is built on top of.

Nope. It's even easier to mod an automobile because it doesn't require a consensus from the mechanics (miners) to make a change. See the block chain size debate if you're still unconvinced.

There are many companies already building services on top of bitcoin, it doesn't take a change to the protocol and therefore it doesn't take any permission or consensus from anyone. I can't tell if you have a fundamental ignorance of crypto currencies or if this was an intentional straw man, but either way it is so far from being rational I'm not even sure how you would come up with it except for maybe learning about bitcoin through a game of gossip rather than reading or experience.