I believe in 5e if the group is required to make checks for something like stealth then only half are required to succeed. Given the rules around Exploration mode something like this makes sense.
I wouldn't like this at all. My buddy being stealthy isn't going to help me. A mechanic that gives me a boost because they tried to give me advice might work, but it should take longer to use the skill in that case.
PFS scenarios sometimes to it like this, but it really depends on the situation. In some cases, it makes a lot of sense that everyone has to contribute, in others even on failure could spoil everything.