Seconded. I've never experienced any of these issues. When I thought someone was wrong or off with my MBP, it turned out to be another piece of hardware or software. I was never an Apple fan, and I've always tweaked even Windows. Likewise, I have tweaked my MBP here and there from a software standpoint, using tools build for it mostly though sometimes command line hacks. I run brew, replaced native BSD tools like ls and grep with GNU versions, no issues. It's a development machine as well, so it gets pretty punished. Again, no issues, especially none OP was talking about.