Good SLT stay grounded. Poor or weak SLT hide in their offices and peer through the blinds as the NQT tries to get a group of ks4 students to move towards their lessons.
I think SLT should have to teach, and by teach I mean teach a middle set y8 and bottom set y10, not a nice y11 class and some 6th form. It would give some of them a rude awakening.
Equally, I do think (and I've already been shot for this once today) that some people do create their own workload in some respects or are quick to moan. They aren't the majority, but they exist in every workplace and teaching seems no different to me.
I'd also be interested to see SLT stress levels vs level of SLT and size of SLT. In my experience a smaller SLT usually had a better grounding in school life and probably felt the pressure more, whereas someone on a large SLT who is an 'assistant associate vice deputy principal' with a nebulous remit that seems to involve rarely teaching and occasionally thinking of a silly initiative for the next 6 weeks that adds to staff workload is probably going to report lower stress levels because they don't actually do anything.
Your post offers the opportunity for an interesting debate around teaching and hours and pressures rather than the goady threads which seem to involve lots of GF going on about holidays and then lots of teachers getting defensive.