I do not see any reference to your title. What do you mean by "Blockchain without cryptocurrency can be amazing" can you give an example and technically how this works.

I am what you refer to as an early adopter and I understand how and why cryptocurrencies fundamentally work.
And they rely very much on a native or at the very least proxy token.
This token must have value on order to incentivise the node hosts to invest time and energy to support the decentralised network.
Bitcoin and its clones uses POW, wasteful but effective. POS systems are the coming next but as yet unproven at scale.
Both must have a token with value commonly referred to as a cryptocurrency (because you can trade the tokens which is necessary for them to inherit value)

I am not knocking your post. In general, the more people talk about it the better for all, but I think such thinly researched posts are misleading and cause more confusion amongst new people in crypto.

Keep learning mate. The Rabbit hole goes deep.