Type alias doesn't save me from typing that stuff at least once, plus I have to come up with a name which adds indirection (and a dependency that I have to mana

Type alias doesn't save me from typing that stuff at least once, plus I have to come up with a name which adds indirection (and a dependency that I have to manage!) that I have to recompute in my head everytime I read it. It's also (mostly?) transparent to compiler which will still spew me with the same unreadable errors and types as before. The C++ modules that you've been advocating for years as a workaround for slow compile times still haven't arrived in my (and most everybody else's) practice, sorry. I do use precompiled headers in some settings to work around slowness, which does help a lot for build performance but is again terrible (breaks modularity, it's basically a choice: #include everything vs have slow build, with little possibility for making a tradeoff).