There are some serious usability issues with Zabbix on an major version upgrade:

• you have to upgrade appr 283 native templates one after the other, using a poor file selection box (at least on Linux). There is no mass update.
• there is no indication about which native templates in your database are out-of-date
• there is no indication on config-->templates about which templates are actually linked to something (except for nested templates, which I cannot recommend at all)
• the default options for a template import are not reasonable

This is highly frustrating. No offense, but looking at all those nice youtube videos using 6.2 alpha1 on a fresh docker setup I wonder have you ever tried to upgrade Zabbix on a real-life system running for a few years on your own?

This should be improved.