More about the Altitude/Azimuth mount.
(Looks very much like a naval turret gun.) The "Alt-AZ" mounting has some important advantages over the equatorial mounting.
But, no "free lunch" - The disadvantages are:
All in all, for all the seemingly short-comings. The alt-az is a practical price/performance solution. Solution to the Alt-az to equatorial motion are well known. Computers (needed for image processing, telescope control and tasking) are now relatively inexpensive.