Yep, old design over 10 years old now. Festool tried to standardise production by using the same body for multiple tools like the RAS, PS200 jigsaw, DX93 and the old model RO150.
Festool left that path and gladly never used the oval dus port again. While it does work and the hose fits just fine if you squeeze it flat, I find it does come off more often than with a standard round dust port.
Most tools have been updated in the mean time, the RAS is one of the few which haven't.