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That's how FPtP works, especially with the spoiler effect increasing partisanship over time. (though the right might be split in 2024 for the obvious reason)
Also the way primaries work... Such low participation that only the radical voters turn out.
I would say it's an over-complicated (by multiple aspects of news coverage) popularity contest. Particularly as there are more candidates, the winner is not likely to be what the actual majority wanted (because FPtP again).
On the left the "safest" corporate Democrat is likely who is picked. Progressives likely even vote that way because of media speculation.
I believe in most Democrat state primaries, delegates are apportioned based on the percentage of vote. On the Republican side, most state GOP primaries are Winner Takes all.
Even so, the Democratic "No change!" candidate always wins.