It's like using the term "COBOL" when you mean "programming languages", and then criticising COBOL's modern utility in that context. The parent comment was about crypto (short for "cryptocurrencies") in general, not Bitcoin, which is 12-year old technology, and broadly not fairly comparable to current cryptocurrencies or their applications.
You are as correct that you can't do much with a Bitcoin as you are that you can't do much with COBOL. This doesn't however mean that programming sucks.
If you're interested to learn about the space and what's going on in it, visit https://coingecko.com, select "developer", and sort the list by "Commits past 4 weeks".
This is a list of currently actively developed projects. Click a few and visit their websites. For example, SC, 4th in the list, is a incentivised and decentralised cloud, which is up and working right now. You can earn money from spare storage.
There are many such projects pushing various different boundaries of technology. I too find it baffling how uneducated and "luddite" many on HN are regarding blockchain and cryptocurrencies. There's a whole world of activity going on, and many here are missing out.