There is more than strength or pretty graphics to the current generation GPUs. Not only the bespoke joke card is significantly faster and far more efficient, but your GTX 1080 Ti is a rapidly aging six year old GPU (bear in mind 1080 Ti is a further cutdown, 2017 reheat of the 2016 Titan X Pascal with a narrower memory bus, thus the 11 GB instead of 12 and faster out of box clock speeds - it is basically the lowest end cut of GP102) lacking virtually all modern technologies and API support.
If you are still happy with yours, that is your prerogative, it remains a solid performer for DirectX 11 games in general, but time is ruthless. The 3080 10GB is about twice as fast as your 1080 Ti, the 3090 is about 2.2x faster + they can use DLSS to further boost performance, enabling experiences that your GPU cannot even dream of, while using less resources than yours would need. Budget gamers with an RX 6600 nonXT are getting the same performance you do at games at a quarter of the power.
oh my so much to unpack here
"There is more than strength or pretty graphics to the current generation GPUs." --what does this even mean, who buys a GPU for something other than pretty graphics besides miners, did you mean mining, i've never associated the word strength with a GPU, are you trying to break one in half?
"GTX 1080 Ti is a rapidly aging six year old GPU" --one could argue that Ampere is a rapidly aging 2 year old GPU, and aging at the same rate since time is a constant and equivalent in this same frame of reference on earth.
"lacking virtually all modern technologies and API support" -- you mean like the 1080ti only has a VGA connector on it and it doesn't have SLI, CUDA, 3D Vision, PhysX, NVIDIA G-SYNC™, Virtual Reality, DirectX 12, Ansel..which it does, do you know what an API is, did MS release DX13 and not tell anyone?
"enabling experiences that your GPU cannot even dream of...while using less resources than yours would need" --- what, you mean like playing games for half the cost whilst using less Watts? My 1080ti only dreams of using 600Watts like a 3090ti.
"If you are still happy with yours, that is your prerogative" --OK, thanks
"Budget gamers with an RX 6600 nonXT are getting the same performance you do at games at a quarter of the power" --- no, they're really not.
https://gpu.userbenchmark.com/Compare/Nvidia-GTX-1080-Ti-vs-AMD-RX-6600/3918vs4128
But even with inflation, paying more for less RAM, a feature locked card with LHR, its still too expensive at these prices, they are a joke.
You sound like Avram Piltch... "When you die and your whole life flashes before your eyes, how much of it do you want to not have ray tracing? Just buy it!"