There weren't spaces in the ancient European texts, but later they appeared.Can it be that absence of spaces slowers civilization development and makes education more complicated? I'm aware of the fact Korean, Japanese and some other languages have no (or hadn't but later introduced) the spaces. Will this happen to Chinese?

Just compare these two sentences and you will see the difference.

你们把这两个句子比较 一下, 有没有区别呢?

你们 把 这 两 个 句子 比较 一下, 有没有 区别 呢?
Belie, everything is relative, so it's a big question who when stole what knowledge and the proportion of steal and invention. However, if something (the space) appeared, then it wasn't just for fun.
소나무 --> in English you know when to write "some", when to write "body" and when to write "somebody"... "give me some sugar" and "somebody's body was found yesterday" may show us how to split continuous Chinese lines
fanfanve --> "fast and well" is relative... using less paper is the benefit which leads to shortsighted eyes... what's more precious, eyes or trees?... words are framed anyway, so why the mental framing isn't reflected in the paper?
22, why should you follow western lifestyle and use air-conditioners and cars?... be traditional, use fans and wagons