The air tubes are usually just PVC with welded seams. These can often be repaired once you find the leak and due to the 'cheap' manufacture process it's likely some will fail time to time.
I take a spare tube and a patch kit to cover most failures.
Most early ait tent failures were due to to outer constrainign sleeve failing from poor design, glue weakening when hot or UV fatigue. Once this failed you were left with 0.5bar in a thin poly bag which doesn't work so it bursts. Most of this has now been fixed through proper materials but manufacturing defects will still happen.
Best you can do it take precautions and expect some expense to maintain at some point. It's going to be a cost of ownership for the ease of use. The bigger issue is likely to be with unbranded tents as tubes may not readily be available.
Saying that, I'm happy with my large air tent, especially that I can put it up and pack away reasonably quickly and single handed while the OH keeps the young kids busy. There are still too young to realy help without being a hazard and after half a day in a car need to blow off some steam when we arrive. In a few years when they are older I'll probably change the setup away from the jumbo tent anyway so if it costs me a bladder or 2 in the interim then it's a cost of convenience.
Don't forget to leave a review of the French and other European campsites you have visited!