I played the trails first chapter during the first weeks of COVID. And a few months later I had completed the other 8 80+ hour games in their entirety. The plot in each game really is interesting, they revamp the combat enough in each game to keep things interesting, and the reactivity of in game characters is awesome. One reason it took me so long to beat each game is because after almost any plot point in the story happens, every single NPC on the map gets new dialogue reacting to it. Running back and forth talking to everyone gets you more insight to the story and you might pick up some hidden quests too.
These games really are incredible and the fact that they all tie into each other makes everyone feel alive and important to the story. Definitely check them out!