SPACE NINJA!!!
Took a break from the game for about a year and a half just because grinding for relic parts was literally the only reason to play the game. Since then, they have already improved on the Railjack gamemode, added new main quests and even more frames and weapons. But this just means that more time has to be spent grinding your ass off to get parts, yet again. Imagine having to use a spreadsheet to keep track of which prime parts you already have, and which relics can give you the other parts you need, just so that you can get what you want more efficiently.
Nonetheless, the three hour grind sessions are back. More kuva weapons to kill for, more parts to farm, and a new free roam world to explore in my Pacific Rim Jaeger/Necramech. Still trying to completely avoid the Railjack missions, but one way or another, I have to go back otherwise it just prevents me from advancing.