If David wanted Joab killed, why did he leave it to Solomon instead of doing it himself?

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The linked question asks why David advised Solomon to kill Joab. I would like to ask a follow-up question: if David wanted Joab killed, why didn’t he do it himself? Why did he leave it to Solomon? And why did he allow Joab continue to be such a prominent individual in his staff (including being a commander in his army) even after the misconduct that caused David to want him killed in the first place?

One reason I could think of was that, as a commander of the army who was evidently politically well-conected, Joab was exceptionally powerful; as such, he might have been dangerous, even to David. If that’s true, though, why wouldn’t he be dangerous to Solomon for the same reason (especially since, as a new king, Solomon was still consolidating his power)?