Negating the question, I’m forced to use V7 because it has MBIM. Only non-LTE devices are still V6. Now V7 does get me zerotier and let’s encrypt, but I’d still be using V6 if it had MBIM. SSTP worked well enough (and still a backup to ZT in V7).
So my “theoretical showstoppers” blocking some upgrade to V7 be:
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the lack of “dynamic-in rules”. e.g. “/routing filter rule … chain=dynamic-in” isn’t available in V7.
See http://forum.mikrotik.com/t/v7-filter-dynamic-in-set-check-gateway-option-not-found/153188/1
The dynamic-in stuff was the better way to set “check-gateway=ping” – I love their scripting language but really don’t like it on some critical path (like the DHCP client for some remote site with only LTE connection) -
I don’t deal regularly BGP, so presumably someone like the new V7 BGP scheme. I’m not sure what the problem with the BGP configuration in V6 that required inventing an entire new language for it. But the ship long sailed on this one. Obviously the lack of BFD be blocking me first if I used BGP, in this theoretical world.