The title is only a joke because oda only wrote zoro giving a shit about it. legit no other swordsman in the story cares about it. like we see others caring about the pirate king title. it would have been nice to see zoro having to fight others who care about the title. wss is such a nonissue that im convinced roger made it up at one point.
Not the first time I read this point and I hard disagree with it.
Zoro not "competing" with people for the WSS title is perfectly fine, because said title is only a bar. It affords no benefits. You simply become it if you become strong enough. It's the simplest thing in this series.
In contrast, if you get the PK title you get power, wealth and fame. WSS, WSM and WSC are just measurements of strength, nothing more, nothing less. Only Zoro cares for the title specifically for a very personal reason, a promise that he took to heart, very One Piecey.
Which also means that while saying "nobody is gunning for WSS' title" is technically true, it's an absolute lie: everyone is gunning to be the strongest even if for different purposes, so to become the WSS, Zoro has to compete with every other swordsman ambitious and talented swordsman, regardless of their personal aims, and with every single fighter between them that he uses as ladders.
That's the competition: every single swordsman between his current strength and Mihawk's, which is every single swordsman in the verse.