Many cars are no longer made with dipsticks. Domestic cars without trans dipsticks have been around for over 10-12 years now. Engines on some Euro cars don’t have oil dipsticks either.
If I remember correctly, your transmission has no stick but does have a tube. You insert a special tool (a dipstick marked in millimeters) to measure the depth of fluid in the transmission, consult the temperature/level graph in the service manual, and determine if the level is proper. For example, if the fluid temp is 40C, you may want 20mm fluid. If it’s 80C, you may want 60mm fluid, etc.
Transmission fluid doesn’t get “used” like engine oil does. If the transmission doesn’t leak, it stays full. Another reason to have this transmission “sealed” is that the wrong fluid will kill it in short order, and making it harder for some kid on a lube rack to throw in a quart of Dexron is, in my opinion, a good idea.