If it's being done with good supervision and attention to detail, warming up with the basics can be incredibly helpful. Many things that are incorrect when doing basic sequences evolve into problems down the line with more complex skills, of course.
However if its really "every" practice for one hour only working on the things you listed (no cartwheel, cartwheel stepins, handstands, basic tumbling things....) and the coach isn't making constant corrections to form and technique....
Its possible, not likely - just possible, that this new coach feels your group's foundation is weak, and is drilling the basics to "get you up to speed". It could be that he or she has a much higher standard (realistic or not) and believes that the only way to achieve it is by spending a significant portion of class going back to basics.
I also have to say, in defense of the coach, that sometimes going back to basics is an absolute must............cheerleaders lol.