If you need other people to convince you to buy something, you should probably not buy it. The expansion will always be there in the future should you ever change your mind.
Regarding the "worth" for its $25 price, this is hard to say. Not only does it depend on how you personally value the new content, it's also difficult to judge the expansion in its current "incomplete" form; parts of the expansion will be released in future follow-up patches. I also think that while it's expected that players are going compare these mini-style expansions with the old Living World episodes, it's important to realize how insanely good of a deal we've gotten with the previous system of just receiving all the content for free - it might simply not have been sustainable for Anet that way.
For what it's worth, I personally enjoy the expansion so far. It might all be recency bias, but I quite enjoy the story now that it's not about dragons. The new maps are nice, too; I prefer them over most of the EoD ones. I haven't really dabbled in the new masteries too much, but so far I doubt I'll be using the rift mastery stuff very much after getting the relevant loot from those. It does feel really good to catch an updraft with the griffon/skyscale. Obviously not every map outside of SotO has those, but these masteries feel like a great QoL upgrade in the maps that do.
Finally, I'm not entirely a fan of the new daily quest and relic systems, but those are changes to the core game and you get those whether you buy SotO or not.
In short, only you can judge for yourself whether you think this xpac is worth it. If you're on the fence you can always wait for the follow-up patches to see what the complete package looks like. Hope this has been of some help!