Obviously I'm aware printing Qur'ans is now acceptable (I own a printed translation, after all). I was talking about at the time.
See, this is what I was talking about. When a division of opinion among religious scholars means that something is forbidden, and when something like a printing press could be deemed to be a forbidden innovation because it could possibly cause erroneous Qur'ans to be propagated, there is already a strong bias in favor of the status quo. While in theory engineering and scientific developments might be acceptable, in practice people will tend to avoid those fields because there is the possibility they could get in trouble for them if some of the ulema disapprove of what they do. Moreover, such trouble is actually likely, looking at historical scientific discoveries (evolution being the most obvious if out-of-period example). As a result, the advance of science and technology will be hindered relative to other religions where there was less doctrinal insistence on avoiding "innovation". This is a strong structural disadvantage.