Science is objective; philosophy is subjective. Science provides answers that are true across all cultures and societies; philosophy provides answers that vary across cultures and societies. Science is solid: philosophy is squishy.
Does anything exist?
Science will say, “yes, absolutely and here are the properties of existing things that we have evidence for.”
Philosophy will have different answers depending on who is answering the question and the sociocultural milieu in which the question exists. “I think; therefore I am.” Is one such answer.
My philosophy is that science should be relied upon whenever we need objective answers and objective answers are possible. Philosophy should be relied upon for everything else. Indeed, that’s what we do right now, every one of us.
I'm not sure it helps to get into dictionary definitions of words like objective or subjective, does it?
But … “Objective” typically means
"not unduly influenced by personal opinions, bias, or prejudice etc". And scientists certainly do try to take all of that into account when analysing their results, when drawing conclusions and when offering published explanations for what the results show … but scientists are also usually cautious enough to avoid claiming their work as unarguable fact.
“Subjective” generally means that the ideas, claims or beliefs, might quite easily be unduly influenced by personal opinions, bias, or prejudice etc.
It would surely be a very serious criticism of philosophy if we say that it is “subjective” in the sense that it's methodology & indeed it's practice, is more open to undue “opinion, bias, prejudice etc.”.
But although I've been quite critical of philosophy in this thread, even I would not say that philosophy is particularly flawed in that sense of being “subjective” … eg I think one of the main features of philosophy is that it surely does attempt to question all sorts of things where any of us (inc. scientists) might make the mistake of taking things for granted without thinking deeply enough about the possible problems.
IOW, afaik that does seem to be one of the main purposes of philosophy, ie to get us all to think carefully about our beliefs, eg to think about how we “know” anything.
But having said that ; if scientists do actually take care to be as objective as they reasonably can, and that is really forced by things like the peer review process, then do they need philosophers (whether they are subjective or objective) to tell them what to be wary of or cautious about in their published research? If they do, then the science literature should be full philosophers pointing out all sorts of problems with the logic, consistency, contradictions, lack of thoughtful care etc., … but of course the science research literature is not packed with any such corrections from philosophers, in fact afaik there is effectively no such corrective contribution from philosophers.
So IOW, as I've said here many times before - I don't think there is any evidence that scientists in fields such as quantum theory or Big Bang cosmology need advice from philosophers about what care they need to take in their published papers (ie the conclusions and explanations from experiments & from the maths). And in that respect I might guess that such caution partly follows from the fact that what we have now as “modern science” really began around the time of Galileo when more-&-more philosophers gradually began to move away from the earlier methods of more ancient philosophy, and moved instead into what became modern science … so in that historical sense I'm guessing that the earlier philosophical ideas of questioning everything, were carried over into what became science … and in fact, that type of care & caution has probably become far more evident and far more of a fundamental principle in current day science than it ever really was in historical/classical philosophy … another factor which might have increased that need for caution and humility amongst early scientists, was that they were often discovering things that seemed very surprising in so far as the discoveries were at odds with earlier beliefs (often beliefs that had been strongly influenced by religion) … and that caution and humility is probably even more pronounced and even more obvious in science today … so IoW, maybe that level of quite extreme caution in science is a legacy of the way science emerged from earlier philosophy circa.1600 onwards.