Article 5 is not a commitment to forces, but a commitment to aid.
So you are saying in a long and winding way that there could be factors in case of the Russian aggression that would prevent the US from sending boots on the ground to defend Poland.
I guess your take is significant in case Polish expectations (i.e., the US fighting Russia for Poland in its defence).
However, for me, it is rather apparent that there could be a number of factors that might render the US direct military intervention questionable.
As you wrote, this is so in the case of military aid or air support, for example.
I'm pointing out yet another factor some people tend to overlook.
I mean a characterological trait that Trump has would indirectly prevent Russia from aggression against NATO countries.
Russia has a good understanding of other countries including the psychological profile of their leaders.
Russia never attacks a country until they are certain they're going to win.
Trump is a risk factor here because he might not like that someone would F with him as he might take Russia's presumed aggression.
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Also, some people do not understand that Russia wouldn't attack Poland that easily for the number of reasons.
We know it that they want Poland to be in their sphere of interest,, but it doesn't equate to military invasion, they would rather achieve it by other means.
They would attack if Poland defended the Baltic states or if Poland or NATO would display a particularly poor defensive challenge.
(what do you think Bobko?)