Convenience-after, sure, but this whole distro is built around convenience-first and sometimes convenience-only. I mean we're also not talking about first offenses here. Ensuring you SSL key is valid is table stakes for an operating system hosting packages, but falling down four times? It's just obviously not a priority which is unsettling for a product that installs and maintains all your software.
If this was a group of devs building a digital egg timer, I'd agree with you, but this is your *operating system* we're talking about.
The only real benefit of Manjaro, as I see it, is a somewhat easier install path, but with the nascent archinstall script, that benefit is mostly gone anyway. If we're looking beyond the Arch-sphere, there's of course a healthy smattering of options with more on offer. You don't have to jump to Debian or Red Hat for quality and stewardship. Just because it's FOSS certainly doesn't mean there isn't real competition.