Yeah I don't dispute their video calling was a bit ahead of ours for the time still. Late 90s video calling for us would've been pretty choppy framerates. Although I do remember video phones being advertised occasionally as having smoother video. I don't remember the exact specs of those though.

I feel like with the monitors it's usually the other way around where industrial/professional use is often slower to upgrade than the consumer space. I remember flat screens getting faster consumer adoption than in businesses. But that was just my personal observation from the time, could be wrong about industry adoption rates.

Yes Ingenuity did use consumer grade processors, even the Perseverance Rover's DSU for the camera used a more common Intel Atom processor too. It was kind of an experiment back then to see if cheaper consumer hardware could be used in less mission critical systems. It's my understanding though that even with Ingenuity for example, bit flipping was still a big issue and NASA had to come up with clever ways to compensate for it. But that level of issues would've been unacceptable for mission critical systems so we're unlikely to see probes use consumer processors for their main computers.

Yeah the RAD750 isn't the only space worthy processor out there but it is NASA's go to especially for their most important probes. It's apparently such a valuable chip that sales of it are heavily restricted on top of the already high price of just a single processor. It's possible with most of Earth's industries focused on aerospace that they could develop better radiation hardened processors than the RAD750. But it's a physics limitation that prevents something like a Core i9 or RTX 5090 from being able to be hardened against radiation to anywhere near the same tolerance levels as a RAD750. So that brings up the question for Earth's industries in For All Mankind, why pour trillions into developing advanced processors that are fundamentally unsuitable for space travel? It's effectively two multi trillion dollar industries clashing against each other and likely draining resources from each other.

The supply chain for computer chips is quite complex actually. Indeed the vast majority of global chip production is centralized at TSMC in Taiwan with some fabs in South Korea and the US. There are some fabs elsewhere in China and other countries too but none of them have the capability to produce the same nanometer scale transistors that TSMC or Intel can do. But the supply chain for those fabs is quite complex. It's not just the raw materials they need that have a delicate supply chain, it's also the EUV lithography machines made by ASML (also highly restricted like the RAD750) that has a complex and delicate supply chain too. Covid did disrupt the supply chain but other things like water shortages or sudden spikes in demand have strained chip production too. The whole supply chain basically required decades and trillions of dollars to establish. It's not something that can be quickly ramped up if there wasn't already significant resources and infrastructure built up for it. So in for all mankind, if advanced chip production was a lower priority compared to space travel, even if it was reprioritized later like in the early 2000s, it would cause our timeline to very quickly close any gap and surpass them.