That's... not a bad thing, though? Terry was an extremely competent engineer and programmer who designed his software to be as user-friendly, well-documented, and performant as possible.
I have conversed with Jörg, and he is blunt and fair in a good way (code itself is emotionless, after all). And, of course, he is highly competent. I have also conversed with several Mozilla teams, including Thunderbird, and the experiences were universally horrible, as in they lacked core competency. Naturally, YMMV.