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- I can't simultaneously play a third MMO (already got FFXI and FFXIV)
- X4 custom start allows me to jump to the parts I want to play instantly, no matter if it's starting wars, flooding the market, dogfighting, etc
- My X4 save is a gzip file: no need to worry about latency after moving to another country etc (my EVE account is locked to a region halfway across the world)
- I don't have to wait for irl people to do something fun in X4
- The gziped save file is in xml format. If something breaks I can just fix it
- X4 has a huge modding scene for whatever features you want
- X4's modding tools are super easy to learn: it's all xml and lua. Took me only 2 hours to figure out how to modify the UI from scratch.