What are the pros of Polyester?

Aside from being cheap/cost saving, what practical reason would I want a Polyester garment over another fiber? For example, I see items like so:

https://www.grailed.com/listings/48070525-groundy-x-yohji-yamamoto-asymmetric-jacket?g_aidx=Listing_by_heat_production&g_aqid=f06e8629bd2d87a9fedb4559823fa2cc

I like the silhouette, I stan the fuck out of Yohji, but the 50% polyester composition just makes me wary. I understand Ground Y is a "budget" line, but is the Poly literally just for cost cutting? Or is there some meaning behind the choice? It's one of my blind spots as a fashion guy, TBH, never really understood why Polyester is bad aside from its reputation.
Grailed
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