That is nothing special – lots of LACs offer 3+2 programs, presumably to market themselves to students who may consider engineering. But the fact that they are rarely completed by transfer to the “2” school (perhaps due to not being admitted to or not getting enough financial aid at the “2” school) means that they are not really good choices for most students who are interested in engineering. Note that they are five year programs, so an extra year of budget is needed.