I am wondering,
some very reputable expedition strength tent manufacturers, such as Macpac (New Zealand) use precurved tent poles of the highest calibre aswell, yet they still make their tents to accept a second set of poles for extreme conditions. The Macpac olympus, for example, has been around for about 25yrs I think, its a three hooped tunnel, and has this option. It is significantly heavier than and equivalent Stephenson though.
Despite the obvious strength of these Stephenson tents from your comments guys, I might have to skip them if they arent bug proof. I am thinking of getting one for Tasmania (Island state of Aus) but in some areas of Tas (usually slightly lower altitudes) leeches are a problem. And I cannot stand them. Without a leech/insect proof tent you would get dozens all over you at night.
I think I might just have to go for a pyramid for a lightweight bombproof tent. The main problem then is on tent platforms as they are not as free standing.
Thanks for comments guys-and that Catalogue sure is quirky!