It seems to me that web design trends tend to change faster than most people's patience for maintaining their personal site, so it makes sense that anyone with

It seems to me that web design trends tend to change faster than most people's patience for maintaining their personal site, so it makes sense that anyone with a sufficient amount of work to do who is not a web designer would choose a very simple "just get the info out there" design. Specifically these guys you posted have been in computing forever and are very, very busy. Personally I can't justify more than updating bootstrap every six months or so. I'd rather spend that time on open source or with my family.