The phrase "be less capable of" is perfectly correct and usable in written English.
This phrase is typically used in the context of discussing someone's abilities or potential. For example, "My friend was always very ambitious, but after moving to a new city he seems to be less capable of achieving his goals."
He hasn't figured out why, but hypothesizes that intelligent people might be less capable of evaluating themselves, making them more vulnerable.
It comes at a time when the Arts Council itself is facing substantial cuts, which will mean that by next July it will have lost 150 staff members and could be less capable of helping artists to develop careers.
In such cases the individual may be less capable of productive work, because energy is drained into the protection of unrealistic self-concepts, or the individual may be burdened by neurotic symptoms.
Children are generally thought to be less capable of moral reasoning than adults; they are permitted to be ruder, noisier, even, in a limited way, more violent; they are seen as less responsible for their actions.
All of these activities make me a well-rounded individual, and certainly not someone who would be less capable of running a company one day.
Tension apparently circles around GFG's prioritization of investment in more developed markets, like the Middle East, over parts of Southeast Asia which it deems to be less capable of returning value.
They're less capable of puppet-mastering the whole scene".
"We don't see any evidence that young people are less capable of voting or less interested in taking part.
But the fact is, many Western expatriates are less capable of escape than they like to believe.
Smaller pixels are less capable of capturing light, and when pictures are reconstituted, the smaller pixels contribute to a grainy effect.
First, since Cameroon's annual temperatures are confined to a small range, the biological systems are less capable of adapting to changes that modify the range.
