>Outlook(web) does atrocious top-quoting rendering it useless for mailing lists.
The weirdly aggressive way people talk about top vs bottom quoting is probably one of the things turning new users away from mailing lists.
Maybe. I think the bigger problem is that there's no easy fix/recommendation to give new users; "stop using your propiatary group-ware that your company/organization pays for" isn't a great recommendation.
My biggest issue with Gmail (as someone who interacts with users of Gmail) - is that it generally breaks quoting and hides this from Gmail users with its magic conversation view.
Outlook(web) does atrocious top-quoting rendering it useless for mailing lists.
In general the web interfaces doesn't work well with hundreds/thousands of mails IMNHO.
They also tend to needlessly lean on html formatting rather than plain text - with things like "my replies in blue" - rather than just proper quoting.
Ed: in general I've just given up the idea that the average user has any hope of interacting well with email lists - which means such lists aren't useful for general discussion (but can still work for specialist groups like Linux kernel etc).
The conclusion being that one will need "something else" for a general audience.
Zulip might be a reasonable compromise.