/global channel would be a welcome addition to FFXIV.

It would be used for many reasons such as trading, RMT spam, LS recruitment/ flaming, leve-link parties, SP grind parties, noobie questions, ranting, and reducing boredom while grinding DoH skills.

FF games tend to attract a more mature or good-natured crowd than other franchises, but boundaries would absolutely need to exist for the channel to have a positive impact. Most importantly:

-two line (whatever amount of text it takes to fill two lines of the default chat window) limit for each entry

-at least 20 second delay before becoming eligible to send another /global entry

there
is
nothing more
annoying
than
people flooding
chat
channels
talking
like this.