In my opinion, there are no large differences between PSE and SO in this sense.
Both on the SO, and also here, there is a requirement from the OP to show his attempts to solve his problem.
On the SO, most of the VLQ questions are coming from beginner programmers in a strong need to provide the software what they are incapable to produce.
On the PSE, most of the VLQ questions are coming from physics students in a strong need to provide the homework what they are incapable to produce.
In both cases is it possible to show, what you tried. A similar requirement would be also a useful defense on the PSE against its degradation to an online, free homework solving service. But there is a such requirement already, and I've seen a lot of homework questions closed on this reason (what I agree in most cases).
A remark: people likes to solve problems, despite that they know, it makes them like a w*. People motivated by such urges, can become later productive users of the site. This is the probable reason, what makes the MathSE a well-going site. And, although the OPs of the VLQ questions don't seem really useful content producers of the future, their answerers do.
Yes, this behavior of the MathSE clearly worsens its mean quality, but if there is a finetuned, predictable way to deal with the help vampires and the repwhores (*), to use their significant content-producing power to serve the site, it can help more as it harms.
(*) I link here a MSO answer, describing the main sociological structure on the SE on a quite funny way :-) I didn't link the question (what is irrelevant in our current context).