In what context, and a plus over what other degrees? I don't agree that it's a plus unless the candidate has double majored in a relevant degree, or did a philosophy BSc. and a relevant MSc afterwards.
If I were reviewing applications for a software engineering role, I would primarily prioritize computer science and electrical engineering degrees, then secondarily mathematics and physics degrees. Of the subset without a degree in STEM, I'd probably weight philosophy higher than some alternatives, but they still wouldn't have priority unless their professional experience was more impressive than other candidates.
I was initially a philosophy major during my undergrad (up to and including 300 and 400 level courses in Kant). I don't think philosophy degrees are a useful signal to compare against more targeted degrees. They can certainly teach logical and abstract thinking; however, at at the default level of effort I've observed, most students do not graduate a philosophy degree with significant enough critical thinking skills to overcome the sheer amount of domain knowledge they're missing by not having studied computer science. And it gets difficult to specify exactly what it would look like for a philosophy major to make up for the lack of computer science education by having superlative reasoning ability, if that's the case.
Ideally you want a student who demonstrated that they put significant effort into their academic work, enough to intellectually grasp it, apply it and reason about it. If you have two students who appear to have put equal effort into their studies, I can't see why philosophy would be a plus. A philosophy degree will be a net negative for the professional functions of a software engineering role unless the applicant has spent significant time overcoming the lag in programming experience and computer science understanding.
In other words, I think people use philosophy degrees as a proxy for overall intelligence and reasoning ability, or maybe even academic effort. But I consider that to be a red herring - philosophy studies are useful, but they don't intrinsically encourage more effort and engagement than more relevant degrees do, and the skills they offer are far less relevant for the professional work of engineers (not irrelevant, just missing quite a lot). If a candidate demonstrates strong suitability for a software engineering role with a philosophy degree, they probably would have excelled with or without it because they had to be motivated enough to self-study computer science anyway. The philosophy major in particular doesn't encapsulate or confer that kind of motivation and engagement, so it's better to just look for a targeted degree.
Again, this isn't to say philosophy isn't useful - much of my dialectic style comes from Wittgenstein. It's just that on its own philosophy is like arithmetic: fundamentally useful and broadly applicable in everyday life, but not nearly enough to prepare one for a software engineering job.