Welcome to the forum,
Shotcut is Free Open Source Software developed and maintained by a couple of people, not a piece of software developed by a multi-billion dollar company called Microsoft. Having said that the capabilities of Shotcut far exceed those of Windows Movie Maker for all but the simplest of tasks. There are many examples on this forum that people have made that could never have been done with WMM. the use of keyframes, HTML animation and complex filters are some examples.
There are shortcuts for doing many operations, but like most things if you don’t know how to do them they may not appear to be straightforward. Take your example of transitions. It is possible to do 80 transitions in just a few minutes. Admittedly it is not as simple as setting a parameter (e.g. transition = 2s), but it isn’t a big deal either - see here: