That post is quite nitpicky, pointing to edge cases and old version behavior. The essence of it is that writing reliable Bash scripts requires significant domain knowledge, which is true.
Bash scripts are great if you've been doing it for a very long time or you're doing something simple and small (<50 LOC). If it's complicated or large, you should just write it in a proper programming language anyway.
Yeah, that's a good point. It's less about LOC than complexity (data structures, complicated string parsing, handling binary data, etc). And that's actually the advice I follow myself.
Some longish Bash scripts are very maintainable and reliable, because they're still quite regular and simple.
Bash scripts are great if you've been doing it for a very long time or you're doing something simple and small (<50 LOC). If it's complicated or large, you should just write it in a proper programming language anyway.