This makes the case for 5 year or so…most of those greens are yellow
I read the chart the same way. Overall, on its own, it doesn't make a compelling case for an upgrade — and that is why many hang onto their 4s and don't upgrade to a 7. It may also explain the popularity of Series 4 and 5 Apple refurbs.
The problem is that so many things in the chart are identical (yellow) or marginal tweaks or small differences (many of the green).
I make similar comparative charts, so take this next remark in that spirit.
Highlighting the benefits in a sentence or two often conveys them much more clearly and forcefully than a chart does!
Someome could legitimately write,
“In key respects, the Series 7 Watch is a substantial improvement over the 4.“
“Compared to the 4, it comes with an Always on display, a 20% larger display, smaller bezels (not in the chart), a better look thanks to the smaller bezels (not in chart), larger battery capacity, rapid charging (not in the chart), on screen keyboard (not in chart), faster or much faster operation (CPU designations are a step removed from declaring ), etc.“
Much more persuasive in laying out the key plusses!
On the other hand, in spite of the chart and the statement highlighting a somewhat (slightly?) larger batter capacity, some or many argue the Series 4 Watch had longer battery life out of the box than the 7 does — again, something that is not in the chart and hidden by the glowing list of advantages!