This is an interesting discussion.
Every company has a number of wrestlers which function is to make the other one look good. The difference between, lets say NJPW and WWE is the fact that in Japan, they let you shine while you put someone over. The is not such squash matches. In every match the jobber or low tier wrestler will get some kind of offense scoring even a pinfall or perhaps a nearfall. It comes to mind Juice Robinson. Back in NXT, he would lose to everyone and anyone under 3 minutes. In NJPW, although his win-loss ratio is really low, he comes across as a believable opponent that will give a good match, come close to winning and eventually fail to a top tier dog. The nearfalls will fire up the crowd thinking that maybe this time he can achieve it which doesn't happen in WWE. If Slater challenges Samoa Joe, he will get little to no offense so the crowd won't be invested.
I think the main issue with the jobber thingy is that in the WWE, there are top tier wrestlers and low tier wrestlers. The top tier wrestlers will always beat the other tier cause they are better than them at any moment. In NJPW, trying to approach a more realistic situation, a low tier wrestler can surprise or be better than a higher tier wrestler at a concrete day because lets say motivation or fatigue giving him much more credibility than a WWE jobber.