Hi, I think you raise an important point with the Frequency of Cut concept. rolla16v has posted that reference before, together with some related issues, in this thread:
https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=49580&page=2

The FOC concept can only be dealt with after you have decided at what height you will cut your grass. Furthermore, I think the Height of Cut is a great deal more important, in terms of both how healthy your grass is, and what it ends up looking like. I'll even go further: I think how often you mow is also more important than FOC.

I should have the sense to leave all of these issues to members like rolla16v who know far more about them than I do, but I think it works like this:
1. Work out what you expect of your lawn: what you want to do with it, and how much work you are prepared to put into it, consistently and forever.
2. Choose your grass type, to suit your lawn design and the answers to Item 1.
3. The decisions you make in Items 1 and 2 will enable you to determine your Height of Cut.
4. The decisions you make in Items 1, 2 and 3 will enable you to determine how often you mow. This is based on the "never cut off more than one third of each blade" rule, together with your HOC decision in Item 3.

Those of us who use rotary mowers are accepting that our yards will be covered with grass rather than lawn, but we still need to deal with those four questions. The FOC issue is one of the many matters still to be dealt with by reel mower users, after the four questions above. As Deejay has pointed out, if we are going to use a properly engineered, well-maintained reel mower on one of the standard grass types at a fairly commonplace HOC for a home lawn, it is likely that the standard number of blades on the reel will suit our needs.

Remember that for Scott Bonnar 45 mowers, the blades move past the bedknife at a frequency that depends only on the engine speed, but the forward speed of the mower depends on the clutch slip rate: you do not usually have the clutch fully engaged whilst mowing. You can change the FOC a great deal simply by running the engine fast or slow, and slipping the drum clutch a lot or a little.