I think it's fairly obvious that the comparison between a bottom bracket, through which all one's mighty power flows, and a headset, which simply has to keep the front wheel pointing in vaguely the correct direction, is an entirely spurious one.
Yeah, my point was that pressing in a headset is no bother because (at least in my case) you only do it once every 5 years or something, for the reasons that you state. Convenience for maintenance is less of a factor than for a BB.
I think it's fairly obvious that the comparison between a bottom bracket, through which all one's mighty power flows, and a headset, which simply has to keep the front wheel pointing in vaguely the correct direction, is an entirely spurious one.