For me bitcoin is money. I use it whenever I need to spend money. So your question could be phrased as "What can you do with money?" As far as ICOs and alt-coins... Those are scams. So an ICO is used to get your money. That is what it is for and once you have them they generally have no value.
I like your straightforward thinking. But I don't think the idea of having decentralized applications and a utility token to run their platform is an utter mistake. However, what's likely to be a mistake is that these ICOs have shifted their focus from building a useful technology to building a trading instrument which in every case has a horrifying ripple effect on the whole crypto-digital ecosystem.
Bitcoin should remain as payment crypto or a store of value. Ethereum and other dApp developers should seek to create useful and usable applications. They should all stop fooling around thinking their token will become the next bitcoin, that ship has sailed already and now the spotlight should be more on the blockchain industry - this is still a phenomenon with a diverse potential.
Well, that reason you have given with ICOs using shifting focus from building a useful technology to just coming up with a shit trading instrument is the main reason it has been an utter mistake over the years and I totally agree with RodeoX. Altcoins have only been a distraction; even those without any idea just come up with whatever they feel like, without a product, just empty promises all in the name of trying to get rich from gullible people's sweat.
Sure, some altcoins may have been an exception but a larger percentage of them are shitty. Like he said, bitcoin is money and I have been using it to purchase for a while even if the real life usage is not enormous yet. I do not have anything against altcoins, and as long as someone somewhere feels it is right to give me their money so as to increase my bitcoin stash in the long run, then I am game!