Interestingly enough, if you keep crafters/gatherers at an equal level, then you only need 1 gear set for each. The only part that can clog up your inventory is main hand tools (As they share space with weapons used by all the combat jobs)
There's very little class specific gear for DoL/DoH and much of what exists is easily outclassed by more generic stuff.
Does it make sense? Well, Scrips do. The talk about leveling up MIN and BOT before FSH doesn't...
Personally, I find it easier to get scrips from FSH than MIN/BOT >.>
That and a vast majority of my Scrips comes from Custom Deliveries which you can do after reaching level 55 with a DoH/DoL class and gives you up to 12 turn ins per week (With a further cap of 6 per NPC per week...) and can easily net you a TON of scrips and really isn't particularly difficult to do with ANY class.
But anyway, Scrips are a thing for when you're level 55+ and even further than that, they're even less relevant until you're at max level (Which will soon be level 80) because the primary use for Scrips is to unlock the ability to gather the highest tier items for the expansion. Which, obviously, is less lucrative or practical outside of the current expansion's stuff.
So don't worry about it, Mine, Harvest and Fish to your heart's content
Also, try and do the daily turn ins for your Grand Company too, they give some nice experience and are relatively easy to do (It's like, 10 of a particular ore/stone/plant/log and 3 fish (1 if it's Mooched)) and especially if you turn in HQ items for extra bonus.
This also works for DoH classes too, you can actually level them up by just crafting 1 item a day and handing it in to the Grand Company for a bunch of experience! (Though, doing the turn ins for ALL the classes can be time consuming for gathering the materials... But doing them on occasion, such as when they're on bonus will slowly level them up over time)