I had to think about this. A part of this also has to do with the face of war in these times. If we're talking about Iraq, Afghanistan, Libya or Syria then I think the first two are now low intensity conflicts (LICs) and the latter fluctuate between war and LICs with many non-state actors involved.
We see that since Obama, US presidents are capable of initiating LICs or involving themselves in existing LICs (for Trump see Yemen and Iran) without any congressional oversight. Presumably, Biden will use this option as well and will have the support of the neocons and thereby won't be challenged when doing so despite the War Powers Resolution. In a way, this seems to be answering to the fact that enemies tend to be non-state actors more regularly than State actors.
My guess is, increase of LICs in relation to the fight against terrorism and geopolitical theatres that require some measure of control because of real politik considerations.
I don't expect more convential wars because I'm not convinced that US military capabilities or budget can be stretched to support another (decades?) long occupation or at least, I don't think there's political appetite for it. Another reason I'd expect de-escalation with Iran. — Benkei
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