In regard to the question on how long you will get out of a set of points, the answer is nobody knows. Points being mechanical – electric devices can fail for a variety of reasons and as such can fail at any time. In real life I have not touched the points in my Twin in 5 years apart from checking the gap occasionally and it gets similar usage to what you intend.
Yes Kawasaki used points back then, but they were cheaper and easier to manufacture as electronics were a fairly new field in automotive technology at the time, and more prone to breaking down. As electronics improved they got fitted more and more often to more and more vehicles. Points are OK, but so were horses in their day but we moved forward 😀