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Ah yes. The cause of this is that the playhead is just a percentage of the way through the timeline--just like the "playhead position" output. The keyframes set it to a percentage of the way through the timeline. So it's more like all the keyframes would have to auto-update. Which would be useful, for sure. But not the default because of how the timeline works under the hood. (So my guess is, such a change is unlikely to be made.)
What I tend to do to control timelines is wire into the bottom of the playhead from the outside. For example, if I have 50 columns, I have a counter (or calc I guess) which gives me the fraction (column number to go to) / (total column count). If I set (colnum to go to) = 3, it'll go to the third column. If I extend the timeline later on to have 56 columns, I can just adjust (total column count) in the counter, and the maths will work out exactly the same.
You could do that with your keyframes too--keep-changes the (colnum to go to) to whatever column you want. Even if you make the timeline a different length and change the (total column count), you still want the same column number, and it'll still work correctly.
Hope this helps.