It's been about 1.25 years since I put together my Z370 build. Since day 1, I have placed all my hackintosh kexts in /EFI/CLOVER/kexts/Other/. I've updated to every macOS revision within hours of release and have never had any issues. I've recorded over 6 weeks of continuous uptime.
On my Z370 build thread (link is below in my signature), through over 550 pages, I've managed to help a fair number others users with all manner of issues/problems. Not once has the solution to any issue/problem been to move kexts to /Library/Extensions/.
Updating kexts has been a breeze. Download new versions and replace old ones. Done. I've never had to update any kext cache. I've never had to use any kext installers. "kextstat" in Terminal has never shown any kext fail to load. (I've also used Clover Configurator to update kexts which makes things even easier.)
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Again, I'm not debating on where's the correct location for hackintosh kexts, just sharing my experiences with using /EFI/CLOVER/kexts/Other/.