If we waited until we had full Excel parity, we would never ship. Google Sheets has been around for 17 years and still doesn't have full Excel parity on features or functions, and that's with dozens of engineers working on it full time.
Luckily now that we are launched we have a bunch of very knowledgable people like you requesting all these features, and this gives us a really good signal for prioritization.
E.g. a bunch of other people also requested the alt-shortcuts, so they are pretty high priority
Highest priority are the bugs like jkaptur pointed out above, and some other people had some crazy CSV files that we couldn't parse. So I'll fix those today and get to the copy-paste-formula-to-range thing in the next day or two. Alt shortcuts is very high on our frontend guy's list.