First off, gas harvesting is a niche role in eve. Low and null, for boosters and WH for Fullerites. My main experience is with Low/Null Booster gas so this will be biased towards that aspect.
Right now you have three main options for gas harvesting: Prospect, Venture, and any 5+ turret ship. Harvesting rates are as follows:
- Venture: 9.6k m3 per Hour
- Prospect: 9.6k m3 per Hour
- Five Harvesters: 9k m3 per Hour
With max Gas Harvesting skills and T2 harvesters Prospect and Venture you can get 9.6k m3 per hour. The 5+ turret ship can run 5 harvesters (thanks to Gas Harvesting) and caps at 9k m3 per hour. This can’t be modified because there are no gas harvesting mods.
So harvesting (in null sec at least) means you get to sit in you gas site for 3 hours mining the 30k m3 gas units in the site. You will often be alone, because gas mining is a niche industry and no one wants to mine gas to help you so you’re stuck in a site for 3 hours.
Is this a game breaking balance issue? No.
Would some Quality of Life changes be nice? Yes.
Gas Mining mods would help the ‘any ship with 5 turrets’ more than the dedicated gas miners, so that seems like a bad solution.
Instead I’d like to see one or two true dedicated gas miners. They could be T2 variants of existing ships, possibly expedition class, possibly exhumer class. One would focus on mining speed, so it wouldn’t take 3 hours to mine a site. The other would be shifted towards ore hold so you could mine the site without having to leave or jetcan.