Classroom management is one of the most important skills a teacher should have. Without it, the school could have the best resources on the planet and could be at the bottom of the league and in special measures.
Teachers are being wowed by modern technology, and like all good people, see it as an easy way to reduce the strain on them. The outcome being that they stop actually being good teachers.
Your right, some teachers are completely unqualified to teach anything involving IT and should be retrained with a fuller skillset before they are assigned to teach anyting involving IT. Despite your objections classroom managment is important as has been proven time and again in may locations. If the teacher is not paying attention the equipment can and does get vandalised, this is nothing to do with software and hardware should not have to be literally bomb proof to survive.
The 21st century classroom does exist and is often not the problem, some 21st century teachers on the other hand...