I have not had the privilege of working for a "tech company" where tech and tech employees are first class citizens. I'm pretty certain the in-house tooling would be much better at a company like Uber or FAANG than a company like mine.
Everything was seamless - I'd log in, tap my security key, and instantly have access to pretty much the entire monorepo and the rest of the production + deploy systems. All of the internal tools integrated with each other -- for instance, I could create a CL (i.e. a pull request) and then fix issues raised by the CI system, entirely from the IDE.
"Owning the stack" completely in-house also extended to hardware -- all of my builds happened inside Google datacenters too (not on my machine), and the development box they provided me was a Chromebook.
Granted, their DNA is still in hardware/devices/OS level stuff versus "services" despite all they claim to be, but how much more quickly could they move if they "owned more" of their stack?
That said, I'm also looking forward to "VSCode front-end in the browser" becoming ubiquitous. I remember using Visual Studio back in my first job in high school, and Intellisense made coding so much more... explorable and approachable.
It’s so good that it would actually be a factor if I were ever considering working somewhere else. Getting to work with Google’s in-house dev tooling is probably worth 15-20k to me. A lot more than 20k if the other company has a reputation for horrible tooling.
To fix the tooling? Maybe..
Also worked at one that developed a ton of tools internally, but I wouldn't call many of them terrible.