No it doesn't, no it's not. It affects contracts that use this functionality with arbitrary untrusted contracts (which is a bad idea), and most contracts just don't use this functionality at all.
It's an issue with Solidity because it doesn't even do static analysis to give the programmar a warning.
It's not that programmers actively avoid doing this or are explicitly warned to not do it. When real money is at stake the language design needs to be a lot more careful.
Even if you wrote all the contracts that are interacting like this yourself, this is an immense source for bugs. As anyone with some experience in concurrent programming or OOP can tell you.
Communication between contracts should have been defined and done via channels.
Note that this covers most other cryptocurrencies as well.
When I discovered ethereum a couple of years ago I thought it was a good idea. Partly because I was turning similar ideas in my head at the time.
But what I read now sounds like amateurs designed & implemented it. Sorry.