It's an interesting twist, but in this Finduilas has even less substance than if the trope was played straight and she was rescued - choosing to marry her saviour and living with him happily ever after involves more agency and character development than being held captive until you're speared to a tree. Tropes aren't automatically bad - I'm not chiefly concerned with subverting tropes, or expectations like our formerly beloved showrunners D&D . But I'm worried that she will just be there for Turin's sake, a MacGuffin rather than a character that actually decides and does things like a person would.I've noted before that the Findulias/Turin story is one where Tolkien subverts the trope in a different way. Turin is given the opportunity to save a "damsel in distress" but then fails. Completely.
This isn't really just about the tropes either, in my opinion ^^ Beleriand will be in a state of basically constant total war, where fighting is essential to survival and therefore everything else - participating in the fighting yourself is more productive and selfless than letting others protect yourself without you protecting them. In our past, women often were considered unfit to fight in wars and therefore didn't come under moral scrutiny for not fighting - nobody expected them to, usually they were even forbidden from doing so. In an Elven society you can have the same dynamic with Fighters and Healers instead of dividing by gender lines, but is that really so well-established in our viewer's minds? If you show an army with a decent number of women, viewers that aren't really into the deeper conventions of Elven society will see that the default assumption of women not fighting doesn't apply here, which opens up all the non-fighters to questions about their justifications for letting others keeping them safe from death or enslavement by the literal embodiment of Evil, especially if the people that tried to defend them lose and die (which will happen a lot).I think it's also worth remembering that the "warrior=superior" and "civilian=inferior" tropes are equally harmful. Findulias does not have to be a fighter to be cool or interesting. It doesn't make her better. It just makes her different.
Exposing and justifying the Fighter/Healer dynamic would help with this issue and be another way of differentiating Men and Elves, but to do that in a "show, don't (just) tell" way we need women that fight and men that don't, without either of them looking out of place - to make the viewers aware of this conscious break of the conventions many would expect to apply. In that way, civilian and warrior roles aren't equal either.
Also, the Elves we have shown are often not just either a warrior or a civilian - the ones that fight have other proficiencies as well. It's not a question of A (civilian) or B (warrior) like in many settings, it's a question of what kind of things the character can do - do they have "civilian" skills and "warrior" skills or just civilian skills? Generally, the former will look more impressive than the latter. Finrod is a philsopher and a warrior, Maglor is a great minstrel and a warrior, Curufin is a cunning schemer and a warrior, Fingolfin is a swordsmith (at least he could reforge his own) and a warrior, Beleg is a great ranger and a warrior. I fear that it will look like someone who has a profession but isn't also a warrior is just missing something compared to all the warriors that are great in multiple fields. They might need something else character-wise and/or story-wise to make up for that in the eyes of the viewer, which can be afforded to major characters but not to all.
Thinking further along those lines, having someone take part in a battle in this kind of environment is an effective and screentime-saving way of showcasing a character and getting the audience to feel attachment towards them, especially if they perform well and/or are in danger. Sure, you can do a lot more for a character - with good dialogue, with a challenge to overcome and many other events and techniques that constitute a well-constructed character arc. But are we really going to have time for many minor character's awesome civilian life story when, between our own flood of ideas and the host's requirements, it comes down what can and should fit into those 13 episodes per season?