Big issue? Anyone can say they've done something - but it doesn't give me any idea of how well you've done it; what sort of constraints you operated under and what your results were like. Were you doing the bare minimum for a year or two? I won't know based on your CV. There's the inexperienced kid who just gets a few projects thrown their way and can say they worked on them, and there's someone who absolutely blew the problem out of the water and created a lot of value... but unless they talk about their achievements on their CV? They're indistinguishable from one another.
Big issue? Anyone can say they've done something - but it doesn't give me any idea of how well you've done it; what sort of constraints you operated under and what your results were like. Were you doing the bare minimum for a year or two? I won't know based on your CV. There's the inexperienced kid who just gets a few projects thrown their way and can say they worked on them, and there's someone who absolutely blew the problem out of the water and created a lot of value... but unless they talk about their achievements on their CV? They're indistinguishable from one another.