So I think a little more detail here is important:
1) It's a double run trial, so if you're running Chances twice in a day, then you'll have Weaves twice for that class, but never more than a single set of six.
2) For this trial, only ONE of the chances courses ran had Weave poles. It was a double run trial, over two days.
This was the format:
Sat: 2 Reg, 2 J, 2 Wv, 2 Gb
Sun: 2 CC, 2 Reg, 2 Tg
Which means that you never were forced to do weave poles any more than 4 rounds per day.
Had this been a format with 2 Regular, 2 Chances and 2 Weaves, and the chances course had weaves, then I would say it's a totally valid complaint.
Chances has had weaves in it since the literal inception of the class.
I would encourage all handlers to do what is right for their dogs. If your dog has trouble weaving because of their build or skill level, then I would obviously not suggest running 2 round of regular and 2 rounds of weavers.
Would be absolutely no different than if my dog had issues jumping, it's not the clubs or NADAC's responsibility to change the class listing so that your dog doesn't have to jump that day, it's your job as the handler to do what is best for your dog. And what is best for your dog, might not be what is best for the other 40 dogs at the trial