Having read a few philosophers, I don't really see any fundamental difference between Feser's approach and those of other philosophers. All philosophers have their positions and try to construct arguments to support those constructions. Feser's positions are traditional Roman Catholic positions, but your average atheist philosopher (such as Graham Oppy or J. L. Mackie) is doing the same basic thing.
I feel like your expectations for how philosophers ought to behave aren't based on any significant familiarity with the work of actual philosophers, just your suppositions about how philosophy ought to be done.
Good point: perhaps I have an unrealistic, dumb, ill-educated or otherwise malformed ideal/view that philosophers should somehow be constantly challenging their own ideas, using their writing/discourse as an instrument to help them reach better conclusions through statement/contradiction (something like constructing an academic essay using thesis/antithesis/synthesis I guess?) and disputing them internally… Actually, as you suggest, the ‘correct’ approach to philosophy, or at least the only realistically possible approach, is to repeatedly state prior beliefs in the most persuasive way possible and then presumably to defend your a priori views from any challenges by others - only ‘testing’ those ideas in reaction by engaging in external debate rather than an internal one… I wonder though, doesn’t the outcome/process of that debate have to register internally somehow, for one side at least, for it to have any point? …for an evolution of the thinkers involved’s ideas to take place, is it not necessary for one/both sides in a debate to have at least a somewhat open mind, even as they strongly debate their particular ‘side’? …to allow one side to change its mind when the arguments put forward by the opposition are significantly strong - otherwise the debate would inevitably become stale, never-changing and circular? If one side is fixed in its beliefs, why would the other side bother debating them at all? If they were interested in adopting those ideas they should merely ‘receive’ them, rather than engage in an inevitably fruitless debate? I suppose if you have an unshakable belief that there exists an eternal and ever-present truth that you are inalterably sure of, and others who don’t agree with you are simply less enlightened, then you may feel that you should never have cause to change your mind - why should you, as you are already privy to the ultimate truth? Your task then, if you are communicative/evangelical/missionary in some way at least, is only to expound that truth to others? Your writing becomes a vehicle to promote your ‘truth’ - truth informed by mystically or intuitively received wisdom, never conjecture… Your debate/writing etc. is not a way to clarify your own ideas, but rather to show others the folly of contrary thoughts?
But where does it end? Is all reason not based on a set of axioms? You can comment on your presuppositions, if you throw them all out then there is no (classical) logic.
Philosophy is a conversation, and valid argumentation is that starting point of any treatise. The work of contending philosophers is to challenge one another, so there should be no hesitation in using less-than-certain (that is to say, all) presuppositions.
Moreover, Feser does comment on his presuppositions in this very article.
> I would qualify this by saying that metaphysics is prior to logic if “logic” is understood in sense (b) described above, though not if understood in sense (a). Naturally, we have to presuppose certain canons of reasoning when reasoning about anything, including metaphysics. But it doesn’t follow that we have to presuppose the codification enshrined in some particular formal system – such as, for example, modern propositional and predicate logic rather than traditional Aristotelian logic, or rather than some system that tries to capture the best of both worlds (such as that of Fred Sommers).
I feel like your expectations for how philosophers ought to behave aren't based on any significant familiarity with the work of actual philosophers, just your suppositions about how philosophy ought to be done.