Pretty much the same reasons I gave you back in July 2018. 😉
With MHW, StumbleSojourn is largely correct.
As for Arcanum, first off, it's listed on the first page of this thread as games not eligible for voting. Also, there is no trainer to be unretired which is primarily what this thread is for.
Keep this in mind. This site and this staff are 100% about providing trainers to be used safely and enjoyed by members. They don't randomly select a few games to ignore to get members upset.
There are ALWAYS good reasons. Too many frequent patches, can't be played offline, has a multiplayer component, not enough members want the game, very few downloads, too difficult to train, or several other good reasons.
There are always good solid reasons games don't have trainers. They do their level best to provide trainers we can use safely, legally and without recourse. As members, we have to trust that. Otherwise, why become members?
For a more detailed answer I'll refer you to this message from Co-Founder PWizard:Link[Edited by Jaks, 8/26/2019 8:24:24 PM]