I agree with your conclusion.
Tamron, whose largest/controlling shareholder is Sony makes both adapted and private-labeled lenses and is the largest lens company in the world. Their agreement with Sony is that they would not sell clones, because most likely the Sony G lenses are manufactured by Tamron. I think they have a similar agreement with Nikon and a non-compete on the S lenses.
If you study Sony's rapid ascension in still photography you'd credit Tamron (and Minolta and Aptina) for a big contribution.
* yes, there is also a large institutional investor with +/- 2% from Sony but they don't play an operational role.
I'm going to begin by wishing every photographer what I wish for myself every time I visit a photo store website. I wish everyone wins a billion dollar lottery so price becomes no object when it comes to buying top line gear. It's definitely a drag seeing the price of a lens and realizing that one could own a decent used Lexus or BMW or Benz...or pay off a huge chunk of their mortgage...for the price on a 600mm or 800mm system lens."But hey, look at that price..."
I'm a lens elitist, wouldn't even consider it.
It's sad when anyone with long term debt or kids to feed and educate prioritize $16k lenses over important life costs but it happens. Generics have an important place in photography.
Putting in the time using cameras and lenses will always lead to better composed and exposed photographs than any gear buying decision made by someone who buys something and expects the brand name to make them better. The first element to becoming a better photographer is never going to be gear.
I do like the elitist reference portion of your remarks. Put a check mark next to my name on that one. If I can afford a system lens, which I usually can, and will be able to use it more than two days a year, which is any lens that will focus within the length of my living room, I'll always buy the system lens designed for the camera I am using. It's a no brainer. Buying top of the line bodies to attach just alright lenses to has always been disappointing because when I see results side by side, the system results are always better (when an experienced photographer is holding the camera) when an image is composed and exposed.
It's my opinion that the user is always the most overlooked cog in the performance of any system. There is good reason that people who shoot any OEM lens system on a regular basis will likely never be thrilled with generics. Generics are less inexpensive because of what's left off of them.
I've got a pile of perfectly usable Sigma and Tamron lenses whose time in my photo life has come and gone that make appearances once in a while, but they will never be Nikon system (or Sony or Canon) designed lenses. But they will be used plenty by whoever I meet who needs a better lens than they already can afford and I give them to them. There is absolutely nothing wrong with any lens if it works for someone but it's impossible to tell what's missing or deficient about a generic lens until you shoot it next to the proper system lens.
If someone is truly enjoying themselves the next time they release their shutter the gear they are using is just fine.
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