>In your previous posts you keep mentioning "designers", plural
Yeah, one at a time. I've been doing it for 16 years, I have worked with dozens of designers over that time. I don't have some sort of stable of dozens of designers to choose from or anything.
>Or would you maybe look for a solid, easily customized solution that is built around design and coding best practices and that is tested by an active community?
Bootstrap is not built around best practices at all, it actively forces you into anti-patterns that best practice is to avoid.
>Do you code your own OS kernel and device drivers as well?
If I were being paid to develop an OS, I certainly would.
>How do you implement a clean grid system that works across browsers and resolutions?
I don't. Grids are entirely unnecessary, and are bad web design. All my sites work fine across browsers, across devices, across resolutions and DPIs, with javascript disabled/unsupported, in screen readers, etc. Note that I've never seen a boostrap site that accomplishes that. Most break on trivial, obvious stuff.
>Are you hand coding your CSS?
Our SCSS, yes.
>or hiring a consulting designer who will probably reuse the code he's already written
Bingo! Where are all these people coming from that haven't already solved this problem a decade ago?
>you can instead use bootstrap
This is all that anyone needed to say. Everyone insisted on trying to fight about this, instead of simply giving me an honest answer: "its just a default design you can use in case you didn't already have one". Given that the answer is so simple, it is amazing how many people just wanted to fight about bootstrap for no reason.