You could also say 26" wheels are not as strong as 24" wheels…..
Spares are hard to come by….?? Rims and tyres are pretty plentiful now.
The advantages of having a big wheel really only come into play on a rigid bike when there is no suspension to help roll/overcome obstacles and they are less agile & slower to roll – how do you work that one out?
I think 29ers are a bit of a fad – Definite troll