Or just moving the collapse button next to the vote buttons, so collapsing multiple comment branches becomes easier. Would not change anything the GP mentioned and would probably be super easy to implement.
Easy enough to do it yourself via userstyle (for Stylus) or userscript (for TamperMonkey)? :).
I'm currently using both - userstyle for DIY dark mode, userscript on mobile for font size adjustment (no Stylus available on Firefox for Android yet). Plus uBlock Origin configured to nuke the karma counter.
And though I don't have a relocated collapse control, there are modified light/dark mode HN styles linked in my HN profile, for those interested in either using those directly or as a starting point for your own restyle.
With that logic, why not just provide an API. Everybody just hack together their own client. Being a hacker doesn't mean you never get to benefit from prior work, or never work together on something, or never share your work.
I get the appeal of providing a minimal service like HN, but unless I'm missing something, my proposed change is an absolute no-brainer considering it's effort-reward ratio.
I'm currently using both - userstyle for DIY dark mode, userscript on mobile for font size adjustment (no Stylus available on Firefox for Android yet). Plus uBlock Origin configured to nuke the karma counter.