It’s like.. hey guys, the rest of the world has been designing satellite dishes for 40 years that addressed these problems including very low cost stuff from the satellite TV era. Why didn’t SpaceX learn from the rest of the industry instead of having to rediscover it?
Elon Musk famously works by „first principles“, which can indeed be roughly translated to „discover everything yourself“. The advantage is that it gives a clean slate for approaches considered impractical when the books were written.
I'm not sure when that has ever worked out like that though. SpaceX built on a lot of existing aerospace knowledge. Tesla went through a lot of manufacturing hell trying to automate what turned out to be pretty unautomatable parts of manufacturing a car. As far as I know, whatever you think of the EV, the car manufacturing process Tesla has isn't uniquely good.
Phones aren't supposed to be used in such situations at all, so it's hard to carry over design lessons from there. Plus the radio frequencies used are new, unlike phones.