Same team, same company - XI had major updates every 2-4 months, an expansion initial release every 2 years excluding Seeker's which came 6 years after the last one due to XIV's production.
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I give any mmo I buy at least the first 30 days to see how I'm liking it. If it's something I'm still enjoying playing daily (or almost daily) by the end of the month then I re-sub. More content would definitely entice me back, especially if it included more quests.
SE has only had 1 other major mmo and they update 4-5 times a year. 1.0 which was failing and consideration of what to do next was still updated every 3 months until the last 6 months in which case it was updated more often. This game already had 2 updates scheduled to release (Octoberish and Decemberish). There is already and expansion planned next year. If they follow the normal cadence it will settle to every 2-3 months for a content update and 1.5-2 years for expansions. SE also decided to minimize or for go most of the voice acting to allow for more content per release instead of more flash.
They have been pretty consistent for over 11 years I don't see that changing anytime soon.