AOO is just benefiting from years of hype behind OO.org, which would be fine if it had community support and was making the same sort of improvements to the code....
LO forked before AOO existed, so you could argue that https://www.openoffice.org/ should offer to link to both versions. (I'm not wholly convinced by this myself, but it would level the playing field, and more people might download the better version.)
if OSS is organic and evolutionary, we shouldn't be discussing market-share strategies. LO, keep on doin'. AOO, you keep on doin' too.
i wouldn't argue anything particular here, just would like to point out that the sentiment of the open-letter is one of coordinated community action, which emphasis on the coordinated.
if i wanted coordination, i'd join an organization, like, maybe, a company, like, maybe, microsoft. naw, i'll just keep on doin'.
This really doesn't have anything to do with market share per se.
He just thinks that marketing an inferior product with almost no community support is bad for users and bad for open source.