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What do you mean by 'beauty of hash tree'? If you are worried about FF merge, you might be right but no-ff is there as best practice for most of the teams so nothing is lost.

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Beauty of hash tree is that hash(commit) = hash(parent commit) ∘ hash(changes). You could compute that by hand if you wanted. But you can't compute merge by hand since it involves basically rebasing commits to a different tree which is non-trivial and prone to introducing errors. If there is 3-way merge you add some changes on top of that.

I don't know what's FF merge, what's no-FF and what you do when your FF merge turns into no-FF.

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