Like the other poster in this thread said: sure your Athlon 500mhz is still runninnfine, even at 80% efficiency
Your Athlon example only works because of where we were in the transistor density s-curve (aka "Moore's law" when it was in the earlier phase and looked exponential). Solar is a lot closer to the analogy at 5 nm scale where quantum tunneling becomes a concern and incremental progress is much slower and more expensive.
Finally, an the toughest, in my opinion, is how little net energy budget they have to work with to be economical: they have to require less energy to build, install, and operate than the incremental solar energy they generate over their operation life. They give an approximately 40% production improvement (that's roughly the single/dual axis midpoint. towards the high side), so if you say a 10 yr life with zero maintenance and controlling a single 250w panel you're talking 9 mWh, or $1080 retail electricity value generated. A 40% improvement on that is only $440 worth of energy budget per tracker over a 10 year life.
That glosses over a ton of complexity like if area is amenable to ground vs rooftop, if it's higher latitude, high density panels, stationary panel/tracking mirror, and most importantly having multiple panels per tracker. Zero maintenance/replacement is not realistic, either, since it would cycling dozens of times a day and could be in hurricane/tornado areas.
But given a lower end garage door opener is $150 before installation costs, it gives an idea how tough that would in that price range. Consider that panels are generally engineered to withstand 100+ mph gusts, and this would be a relatively finely tuned machine attached to one or more 18 square foot kites that would be expected to withstand the same conditions.
https://news.energysage.com/solar-trackers-everything-need-k... was a pretty good article I found on it.
I should not that I didn't say it Shockley-Quiesser was a hard cap. I said it was the theoretical limit of a p-n junction cell. I said, "hard cap is insolation".
Its a rather simple calculation, where do you think the cost of energy will be in 20 years and how will the amount of energy you consume develop in that time.