My ex-boyfriend called me "insane", but I genuinely prefer ye olde 6-key arrow cluster from the Thinkpads of yore. I quickly got used to browsing with pgup and pgdown, now any keyboard without those keys adjacent to the arrows just feels wrong to me.
In any case, the keyboard on the Framework is fully replaceable. If there's significant enough demand for an inverted-T cluster, you can bet there are people who will make the replacement for it (if OEM doesn't get to it first).