A technical problem can be deemed as outwith the airlines control ( by the airline obviously).
We recently saw an airline declare force majeure re a delayed flight due to a technical issue and needed a new part. They stated as they had carried out all reasonable maintenance in a timely and efficient manner, they could not have reasonably foreseen and prevented the technical issue that suddenly arose and as such they could not be held accountable and refused all payments by subsequently declaring force majeure to absolve themselves of all financial obligations.
Not pretty, but there it is. Some airlines are paying, some of the time, but it would appear most are not paying, most of the time, and seldom do they advise passengers of their rights. so don't assume simply because its a technical issue the airline will pay, we are a long, long way from that sort of transparency and honesty.
As one would assume all commercial airlines carry out all maintenance in a timely and efficient manner, one would have to assume they could all play the force majeure card every time a tech issue arises and claim they could not have reasonably foreseen it, and then subsequently absolve themselves of all obligation to pay any form of compensation.