I think it's a preference thing ^
the Emerica shoes just don't seem to work for you but are in no shape/form objectively "bad" or "subpar." The build quality is there, save for your rare cases of having issues on the KSL. I've worn 4 pairs, and skated 2 of them. Never had the issues you and your friends described. Seen other people here on Slap and in person rocking them and never had those same issues. Maybe you all should have contacted (if you didn't) Emerica customer service to see if those were defective pairs, tbh.
The G6 foam in the midsole is easily some of the best tech out there. Beats Nike's Zoom Air, beats anything Vans does in their cupsoles/Cush insoles, better than most of the stock NB insoles (contends with top NB cups/tech), beats Adidas standard midsoles (contends with the Forum/Tyshawn), and still offers board feel once they're broken in. Metric of boardfeel being the deciding factor of whether a shoe is "good" or not seems odd, because it's subjective. You buy a legit cupsole from Emerica and then complain it doesn't have a specific level of boardfeel offered in thinner cupsoles from NB (440, 508, 288s, etc.) That seems like such a weird comparison. Unless, you're grouping 1010/808. Those have less boardfeel than the G6 cupsoles, but people still like em.
Like any good cupsole, they need to be properly worn, then skated to experience how good they are.
The Reynolds G6 had such a locked in heel cup, though. That shoe was ankle stability 100%. The KSL is diet Reynolds G6 in terms of similarities (for anyone curious about a comparison). Same sole, but different upper. I've found it to be really stable and supportive. My feet rarely hurt walking in or after skating in the KSL or Reynolds G6.
Cushion & stability arr somewhat subjective and shouldn't be painted across the board that Emerica makes bad cup soles with no stability, because that's plain wrong.
People regularly confuse preference issues with actual build quality issues on shoes and it's kinda annoying.
Last Resorts look like shit to me, look like they're poorly made , and don't seem to last from what I've observed. However, I don't like Vulcs anymore and how thin those shoes are, so I know to separate my opinion from what's fact. They're not poorly made and not subpar, they're just not for me. Same for anyone who doesn't jive with the G6 cupsoles.
KSL G6 flicks superbly, is comfortable, pretty durable, looks good (not too simple and not too tech), feels supportive but still gives me more than adequate board feel, and fits my foot well. They don't really need to figure out how to update their fit necessarily if it works for so many people.