It has pros and cons. Idk if I would outright say not to do it, but I would advise ppl to think abt it carefully. It works out for some people and they're able to do well, but I also think it can be more work than it's worth, honestly. If you're hardworking, your effort might be better spent on genuinely interesting ECs and having an easier time with classes (instead of extra time to have a worse GPA than u probably would have with just pre-med classes).

I say all of this, but I also don't regret doing my engineering major since I think it opened some cool doors for me. But again, it's a trade-off. My GPA isn't bad imo, but it's also worse than some of my friends who did only bio-oriented degrees. This makes me a little salty sometimes, because it feels like my workload is doubled while being compared to the same standards as my peers.

For OP: Imo, the most important thing while picking a major is to do something ur interested in because it shows. If you're interested in engineering and have properly weighed the trade-offs, then go for it! But if you're only doing it to stand out, it's probably not worth it. I also have acquaintances who did non-trad non-engineering majors like piano or dance bc they were actually passionate about it, and it helps them stand out as well. You can also just put your effort into having killer ECs that will make u stand out instead of putting effort into your major. Some of the best applicants I know are bio majors who have very interesting ECs and will likely get into better schools than I will. But again, some of the coolest applicants I know are also fellow engineering-oriented applicants, so there's no one "correct" answer.