I'm personally quite ambivalent toward dupes or fast fashion as a whole. And when these discussions come up I absolutely understand everyone's point of view, to the degree that it makes me look passive.
I appreciate affordable options, and need them myself usually because I'm a homeschooling mom. My husband makes decent money and we have a modest home, cars, etc., but affording extras is difficult or even impossible sometimes. It's a challenge to obtain even samples. We also don't live somewhere with any upscale fragrance stores.
That being said, I always prefer, even if only 5% more, original fragrances. I can percieve some differences between dupes and originals. Even if I like the dupes (I have a Be Layered dupe of Delina which I won in a giveaway, and a Twist dupe for POAL which I found at a thrift store almost full), they smell slightly...rougher in texture. It's likely that absolutely nobody could detect a difference from afar in the sillage, but I can up close. I also found a dupe of Gypsy Water from Fine'ry at Goodwill recently...loved it, but didn't even realize Fine'ry was a dupe brand until I went home and got online 🤭🤦♀️ I ordered a sample of GW to figure out how good "Mysterious Nomad" is in comparison, and it's decent...but it's less naturalistic smelling.
My bread&butter is shopping B&BW sales (although I'm fed up with poor performing sprays so I'm probably done with them), or finding stuff at Ross/TJMaxx/consignment/thrift/clearance, and saving for very occasional purchases of things I truly love.
So am I a proponent of dupes or fast-fashion brands? Including B&BW and Victoria's Secret? Sure. Some things are still, very enjoyable and unless you're dialed in and familiar with originals from designer or niche brands, the deficits in scent are negligible. But, if that 5-10% of elevation in quality (probably better naturals, and/or better fixatives, and certainly better packaging) matters to you, it's probably a disappointment. I feel absolutely NO allegiance to luxe brands/companies though, and no moral obligation of "owing" them for inventing something. I actually, quite appreciate competitve affordable rivals on the market.
TLDR - I like to have a good amount of affordable stuff, but I also seek out to own a few super satisfying originals. Most of all I love glitching the matrix by finding sales, going gray market or poaching thrift or estate sales 😈