https://journals.sagepub.com/doi/10.1177/2167702620921341 - the bigger takeaway from this one is that trigger warnings reinforce trauma as a central part of the traumatized individuals identity but they did find some incidence of drawback/harm
https://journals.sagepub.com/doi/10.1177/21677026231186625 meta finding no benefit and actually can cause an anticipatory reaction making the person more engaged with the material
There are others, this is just what grabbed from 30 seconds on google scholar. Its been a bit since I’ve done more serious lit review and it’s not like I keep a directory of papers I’ve read
The issue is the culture surrounding trigger warnings. Let’s be real here, people looking for trigger warnings are generally (perhaps overwhelmingly) not looking for material to help with their exposure therapy. They are looking for a “warning” to help them screen material to avoid. The issue is that this creates an unrealistic expectation that is incompatible with the real world. You can avoid suicide, sexual assault, eating disorders, or whatever in your media (maybe) but real life won’t sanitize itself or warn you. You will encounter these topics, whether through the news, careless speech from friends, or even intrusive thoughts of your own. Research continues to show that avoidance of upsetting topics can worsen anxiety and ptsd symptoms
To your final point the idea of it helping to create a choice isn’t even as clear cut as you describe
https://journals.sagepub.com/doi/10.1177/21677026221097618 content warnings actually increase the likelihood someone will view problematic content. This point is further reinforced by similar findings in the meta linked above
So you have a system that ultimately makes creators feel like they’re doing something noble, that is likely at best useless and potentially harmful. Said system increases the likelihood that a person will view the problematic content but also enables the reality that a person will simply avoid the things that provoke their anxiety which again is more strongly established as harmful
https://www.sciencedirect.com/science/article/abs/pii/S0005796712001064 - ptsd worsens with avoidance
https://www.sciencedirect.com/science/article/abs/pii/S0962184904000290 - anxiety disorders do the same
You can also use komf alongside komga/kavita to just scrape metadata automatically upon import. A bit finnicky to get going (a tampermonkey script is required to give it accessible setting on the komga page) but works very well and even has a gui for identifying results and selecting the correct option if the auto scrape fails similar to jellyfin
For the actual reader part I just use komga as a server and read through Mihon (one of the tachiyomi forks) on my ereader mostly. occasionally I’ll use paperback on my iphone (although recently I’ve been trying Tachimanga, which is basically an iOS tachiyomi fork). Loads library, can sort by tag/library/date added, reads most things very well, can sync read status with the komga server (and/or manga updates or whatever), etc.