the difference between 77 and 76 is very small
The 7700(X) has two more cores, which will give it significantly more longevity.
Not an issue if you're planning on future upgrades, but something to keep in mind. The 7600(X) is still plenty for an RX 6750XT.
I totally lost the plot, but there is some evil corporation involved.
The plot is that all of them are evil (it's part of the definition of corporate personhood) and this is a cosmic battle to determine which one gets to eliminate their competition and complete the enslavement of their cumulative consumer base first.
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Upstart? AMD was founded a year after Intel and twenty four years before NVIDIA, and has been a major player this whole time, even if they only recently surpassed Intel in market cap.
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Not sure what world you're living in, but Intel still has a commanding lead in CPU market share and NVIDIA has an even larger dominance when it comes to GPUs...and they've both been abusing their positions for decades.
Intel has sabotaged compilers to produce suboptimal code for competing products; tried to patent troll competitors they couldn't buy out; offered discounts, secret rebates, and outright bribes to keep OEMs from adopting competing products...and lost the lawsuits to prove it. Now they're taking assloads of public money in the name of national security because they screwed up a while back and let TSMC gain a multi-year lead in the foundry space.
NVIDIA has consistently pursued a pattern of developing proprietary solutions, courted developers to adopt them, then done their best to discourage more open standards. And when they've had to allow their technology to work on other hardware they've been inclined to sabotage competing products through intentional deoptimization of their middlewear, even at the expense of their own consumers' experiences. GameWorks features on early DX11 hardware was a prime example of this. NVIDIA knew they had superior geometry performance, but nothing was leveraging this advantage, so NVIDIA couldn't really sell it. Did they come up with something that actually improved IQ? Nope, they had the crap middlewear they pressured everyone to use squander geometry performance by applying stupid levels of tessellation to scenes...even parts that couldn't be seen.
Crysis 2 had tessellated flat surfaces (thousands of triangles where two would have worked) and tessellated water underneath maps that had no bodies of water in them.
Witcher 2 and 3 had 64x tessellation on everyone's hair with HairWorks enabled, when 8x was visually indistinguishable. This is why AMD drivers, to this day, still have a tessellation slider. When that feature was introduced, you could just drag down the slider to a reasonable value and games that used to run like crap on AMD magically ran better on AMD than on NVIDIA, without looking any worse...leading these games to be patched to do what AMD's slider had done, allowing NVIDIA to retake a narrow lead. The modern day incarnation of this ray tracing. NVIDIA has an enormous lead here, which is why so many games run like complete crap with ray tracing enabled, even on NVIDIA cards...NVIDIA will happily blow their own feet off if it means catching AMD's knees too. If AMD starts taking RT seriously, a pile of games will not-so-mysteriously start to run much better on my NVIDIA cards. They've also abused their relationships with AIBs (something they probably learned from 3DFx), as the recent collapse of EVGA's GPU division bears out.
They're all overtly and unabashedly capitalist, which is also pretty much part of the definition of corporation. Both AMD and NVIDIA are subsidizing their AI war with profits that came from their consumer divisions, which is why they're tacitly colluding on moving to a 30-month consumer product cycle, so they can milk us with old product longer as they focus on competing in other areas.
Among the corporations mentioned AMD is far and away the least monopolistic and anti-consumer of all of them. Still evil of course, but thus far much more subdued and less comic book villiany. As they become more competitive, they'll get worse, but in the current race to a PC hellscape, Intel and NVIDIA still hold the lead.
I don't know it just doesn't seem worth it to upgrade given how capable it is. And our house has about 7 macs in it. Well... i guess since apple silicon im personally done with the mac ecosystem (happy to used unpatched until the hardware dies) so in fact that's probably what's going on.. yeah the next upgrade will be a pc, will pick up where i left off in 2007 
