Actually, you seem to be missing my point. I'm not arguing about...

Actually, you seem to be missing my point. I'm not arguing about using angles vs using straight lines. I'm arguing in favour of using logarithmic price axis rather than linear, when you look at long time frames.

The reason is simply that over long periods of time, markets grow. Over short periods of time, you can't tell the difference, but over 25 years, the difference is material.

When you draw angles on a semi-log plot, you are looking at angles between different growth curves (e.g. between a 4% growth curve and a 16% growth curve). I don't see that this contradicts your argument for using angles at all.

The only difference is that the numerical results are different.