So, I get what you mean. Think about it more like this. Gold is expensive, right? People want gold because it’s valuable. But what if gold was way more inconvenient to move around. Like if it was way bigger. That’s not desirable. You want it to be valuable, but not expensive to manage. (Security aside, because obviously you want to protect your valuable things. But even if gold was inconvenient to work with and you had a lot you’d still want security.)

Cryptocurrency Blockchains give the miners rewards for working, but there are also transaction fees. The miners get that too. If the amount of data you’re storing in the Blockchain is bigger, then the fee would be bigger. Which isn’t good.

I hope that clears it up lol, I don’t know if I made sense.