I only ever used conventional pole awnings but with regular use which produced familiarity we could at a push get a large awning erected and pegged out in 15 to 20 mins.
All (especially full size) awnings have big panels of fabric and will be just a susceptible to the effects of wind regardless of how they are supported, so inflatable or conventional poles, all types will need roughly the same number of pegs for any given wind conditions.
As for guy ropes, again depending on the wind conditions guy rope may be necessary, but there are ways of angling most guys so they still provide the hold down force but don't produce an undue trip or encroachment problem.
It's my impression the inflatable awnings have just about reached a level of maturity to really match the the conventional pole systems. I have watch all types of awnings being put up over the years, and inflatables do seem to go up more easily, and of course the issues of sorting out which pole goes where, and has it been extended enough have all but disappeared.
I'm not sure if there is any significant weight reduction, but you don't have to stow the poles separately so there are easier to transport.
If a someone falls or drives a bike or car into inflatable awning, the tubes will absorb the deflection and then pop straight back, unlike a pole which may be damaged beyond repair. Equally there is there is danger of someone being impaled by a misused or damaged awning pole.
Not related to caravanning, I was at a Beaudesert Scout campsite for the Cannock Chase 40 mile walk event a few years ago. A very strong wind developed and a large frame tent and some smaller tents belonging to other groups, were blown down the long camp site. Not only did the support poles bend, they were flailing around as they rolled down the field and some other campers tents were damaged. Fortunately no one was injured.
Conventional pole frame designs will be more resistant damage from pointed objects, but if a pole does fail then it's unlikely the owner has a spare with them and as most of the poles are of different lengths the chances of having the right one would be very low, so the awning could become unusable.
By comparison, whilst an inflatable tube is at a higher risk of damage from sharp objects, it's not too difficult to carry a puncture repair kit. The kit could be used on any of the tubes so it's a practical solution. Different manufacturers will adopt different constructional techniques, but I do wonder if any produce easily replaceable inflatable tubes?
I am certain we will see inflatable awnings and tents becoming increasingly popular.