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I like learning so i'll explain it just as i understand it.
Steem fixed RCs because of something called blockchain debt. I don't really understand what that is but i figured free transactions aren't entirely free. something has to be used up. On steem, RC are like gasoline to help accounts transact. they are used up, but unlike gasoline, they are renewable just by letting some time pass (much like our voting power or mana).

Imagine a country where gasoline is free for every car owner. While some people do too little driving in a month, you can bet there are some people who would abuse this freedom. They'd take their cars for joyrides anytime even when it's unnecessary because the resource is available and the government pays the bills from everyone's taxes.

Steem as an economy used to function that way. Spambots would send hundreds of memos to Steem accounts everyday, which seemingly increased this imaginary blockchain debt.

With RC, however, every account is responsible for their gasoline. it is not readily free for everyone anymore. To transact more, you need more SP. this means account holders need to buy Steem and powerup. In the future, more powerful dapps would need more Steempower to function properly. It is good because as they hold Steempower, they can generate more revenue for themselves by voting on their updates and stuff.

That's how i understand it. It's pretty basic but it works...
Please to meet you, I'm from Africa. :-D

Limiting use is a necessity on any blockchain for technical reasons. The debt is far from imaginary.

A steemd node needs to serve the requested content quickly, which is why it keeps everything in RAM or on expensive quick hard drives. This leads, among other things, to the enormous cost steemit Inc and other API operators have for servers.

Got it. Thanks for taking the time to explain.

Thank you for this!

hey, i think i get it more now, ty ! (-:

that's why there should be like a FAQ of terms somewhere, but oh well, but it on the list of someone to do (-: