I trulty don't understand his reason.
At my age, I prefer to drill XingYi than to drill long fist. One day if I feel great, I will drill long fist. If I feel tired, I'll drill XingYi. For the amount of energy that I spend on 30 moves long fist form, I can spend the same amount of energy to repeat that 30 moves XingYi form 3 times. To me, to train XingYi is 3 times easier than to train long fist. I believe the main reason is the XingYi doesn't have that many kicks and jumps.
The only concern that I have toward XingYi is the leg skill training. If I can repeat foot sweep 20 times, I can feel my single leg balance is good (this is extreme important for people in their old age). I don't get that kind of feeling when I train XingYi.