I can't even begin to imagine what sort of mind could observe the quality of Big Tech's software output and conclude that there's nothing wrong with their hiring process.
Big tech software is successful and runs at scale.
I've got anecdotal experience in both worlds and no. Big tech software isn't faster (what you have is way more compute resources usually), and the claim about "less buggy" gives me goosebumps.
All the software I use. Netflix works perfectly every time. HBO Max is garbage. Amazon's website and app are pretty good, although the actual goods sold are trash. Costco is exactly the other way around.