That's all it has ever needed.
I appreciate the truth of your comment, but respectfully disagree.
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You don't build a defense force and strategy for the conflict you hope happens. Hubris kills.
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Our needs include all of NATO's needs, and to a far far smaller degree, any UN peacekeeking or similar function.
A 5th gen stealth fighter presents desirable attributes for specific purposes, but to your point they aren't the bulk of the work to be done.
The cost saving of a single fleet of F-35 also inject various fragilities of their own. Not the least of which is the catastrophic losses from a single plane going down from anything ranging from enemy action to training accident to supply chains fuckery.
I won't shed a single tear for the F-35 if we cancel the whole lot. But having some 5th gen makes sense. We should be going with the Brit or French led consortiums of middle powers, not US, Russia or China.