Like Buki mentioned it is fun testing out different servants, especially if they aren’t available yet in NA. It also encourages you to raise other lower rarity servants that have received buffs. Paraselcus for instance will be my next priority (or once my basic needs are covered)
It also makes you appreciate your current team more when you are unable to rely on it. Honestly it is different playing with substandard support and lacking dps in every class…but at least I can use DPS support instead so it is kind of an upside.
One other advantage is that it helps reveal a glimpse of the future and if there are any servants you will be interested in eventually obtaining or not.
There is a large difference between reading about skills and stats and actually experiencing using them. Some might look boring on paper but are fun to actually use.
Only downside is the required materials are story locked unless you are lucky with events and they might also require progress in the main story. It is discouraging to try and catch up to do events in order to raise servants you need in order to catch up. Feels like a proper catch 22.
I’m still in that boat, I need something from Lostbelt 3 for my favourite Servant and I’m only halfway through the second.
As for the story, my japanese is basic and beyond rusty so I skip it. I’ll read everything when NA catches up.