If you take a look at
Google's IPv6 data, you will realize that IPv6 adoption in Latvia is negligible. Guess that's one of the reasons for its current state in RouterOS.
last time i talked to Mikrotik employees, they said that they have almost no presence in the government network of Latvia. i was shocked... if my country had a world-class networking gear manufacturer, i'd rely on them for sure (country's good, boosting local economy, etc) but i don't govern Latvia. but in general, the latvian population is far less in numbers, than the sum of all other countries to whom Mikrotik supplies devices with routeros. I assume the Mikrotik dev team's expertise in IPv6 doesn't come from browsing facebook or watching youtube videos over DS network - as this is the most common traffic over IPv6
so i just would not judge by the this value.
i'd rather say, the overall adoption of IPv6, especially with smaller WISPs is struggling. IPv6 is drastically different from IPv4 in some aspects, and bunch of networking folks are just unsure/afraid. so their move is to go along with the stuff they think they know more: IPv4 and NAT. Mikrotik is a company that tries to fulfil the demand of its customers. If your compare the number of the folks around here, who have some sort of clue about IPv6, versus the others who don't know it, you'll see why this ain't the biggest focus.
but let me tell you something. i've been looking for wireless gear what can reliably deliver ~500-600Mbps on short distances with 5GHz & 2x2 mimo. none of the commonly used suppliers have anything that is just manageable via IPv6. i've tried mimosa, ubiquity, but no success. Believe me, Mikrotik is far ahead of those folks in terms of IPv6.
but you should check out the MUM presentations in the last couple of years. when it comes to IPv6, most (if not every) speaker is focusing on basics. whereas you can find no MUM session that is trying to explain how IPv4 works and what type of addresses you can use there. simply most of the community is just not ready for deploying IPv6.
and i don't bash the Mikrotik community, as there is a far bigger group of people to whom IPv6 is like cross and garlic to vampires: most enterprise IT folks
=> It should be enabled by default and provided with FastTrack feature.
this one above is especially important.