That's basically what the TC suggested but was subsequently ridiculed (Just refer to all the stupid tags that were added to the topic...) for daring to want S ranks to actually live long enough for people to locate them in the first place.
I've already stated it previously, but I would not be against the "first come first serve" mentality if not for the fact S ranks are almost always immediately detected/relayed across the entire data center to a few specific channels by bots and this has the potential to get even worse with cross DC travel being a thing soon. It's already not uncommon for me to see upwards of 20 people at a S rank within about a minute of it spawning, which at times is how long it takes me to even find the things in the first place.
This isn't simply a matter of being fair to slower players anymore so much as it is being fair to everyone who isn't using third party programs either directly or indirectly via the relays that are posted on specific websites. This has been a problem since the introduction of hunts, but it's become more and more pervasive as the programs are repeatedly refined and knowledge of them is spread, whilst those who are not aware of them are even more out of the loop then ever. It's just made hunting a considerably more stressful and less entertaining experience as time has gone on...though crossworld hunting in general was probably the biggest contributor to that overall.
Overly possessive players like that are thankfully a minority. Picking off A ranks really isn't a big deal because they only take four to six hours to respawn anyways.
It's the S ranks that annoy me due to how insanely variable their spawn windows are coupled with spawn conditions can be extremely tedious, but still possible to fulfill accidentally (IE, the treasure map spawned hunts). If people want to pick those off, fine, but they really need to add a way to check their spawn windows in-game to know whether or not you're just wasting your time and/or gil trying to pop something that has zero chance of showing up.
As far as the hunt flooding goes, it's basically always going to be a problem unless they either make offworlders unable to hunt at all or do something about the hunt radar programs that are allowing information to spread far faster then the devs ever intended.