They both have their niches and it's welcome in my opinion. Now there are questions about the long term viability of Zig's ecosystem... the niche being smaller it's more at risk.

The concept of allocators in general and arena allocators in particular is too little know. Here is a little article which rediscover the motives behind them. It's a good introduction to the topic.

Interesting article. There's clearly space for both languages indeed. They'll end up having each their own ecological niches, probably with some overlap.

In the end, this is a nice conversation about language design...