I’ve found this to be hit and miss, depending on the connector they use and how it mates with your power inlet. A lot of folks wrap a piece of electrical tape around the plug, although I’ve never done it myself.
I've seen people change out the female socket in their component to tighten it up.
Manufacturers are generally not going to make it tight unless they are selling both halves and even then they will give plenty of clearance. Won't fit in the hole is a sure way to get a sale returned.
Frankly, I'm not sure what you are concerned about. Is the wire sagging a big as it comes out of the component? I don't think there is any concern about the electrical connection.
I think Synergistics makes little pieces that go around the cables to tighten them up. If not them, I know there are others who do. My buddy just got a few of them for the same reason. Little film pieces molded to go around the cable ends.
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