This is mainly due to the limited chance to use automation and the need for much more hands-on, manual piloting. Indeed, some of the smaller airports these planes will land at will often have a lack of navigational equipment and so rely on the manual flying skills of the respective pilots...
The fact is, there are multiple such finer details that build up to contribute to the overall pleasurable experience of taking one of these digital planes to the skies every now and then. Perhaps these finer points of authenticity are due to the input and testing of the software by genuine ...