DT
I am so Smart! S-M-R-T!
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Arrival is one of my favorite Sci-Fi films of recent years, and the visual effects help sell just how foreign the aliens are.
Arrival is a favorite of mine. It's one of those beautiful stories that uses "sci-fi" as a mechanism to explore the human condition/choice/life, and I dare anyone to not get a little emotional when On the Nature of Daylight kicks in at the end

Hahaha, after I read this last night, I tossed it on, so good even the 10th+ time.
In the sci-fi and adventure genres, though, I'd say special effects are required to move the story along. I can't imagine Star Trek:TOS without the transporter sequences or seeing the Enterprise being cocooned by the Tholians. Trouble is, over the years the effects have come to dominate, so people walk away raving about the CGI rather than the plot or acting.
Right, it's very dependent on the subject matter and some genres are [obviously] more reliant on FX/CGI.
Like Harry Potter movies involve magic, flying brooms, mythical creatures, fantastic locations, demonic spirits, shapeshifting castles, they kind of require the use some CGI. There's plenty of character interaction and development, some of the best story beats don't involve CGI, but just the nature of the source material makes CGI a necessity.
You also have to factor in things like safety, feasibility, cost, and being able to, as a director/writer, have a vision that isn't hampered by technical limitations.