This to both. However, the problem with the web is there are old implementations that must be maintained in browsers for backwards compatibility. The issue with this is that it increases the barrier to entry for web development because it's much harder for a new person to even know what options to gravitate to.

Of course, there are books and guides to help people, but how would someone figure out which guides are worth it? There are a lot of highly rated books on the topic of web development and if you don't already know what you need, it can be daunting.

But yes, flexbox is great.