We were avoiding the portrayal of 'get off my lawn!' Thingol in Season 5 by showing his reasons and deliberation that went into his decisions regarding Men.
Which is in hindsight may have been a little contra-productive. Thingol has the souverain right to let into his realm whomsoever he sees fit and to exclude from it as such respectively. He is not due any justification to the audience, as he is above our judgement. To explain his motives, and to explain them making the reason be "fear", lessens him in the eyes of the audience quite considerably. The gain might not have been worth the cost.
Thingol is not a mortal, he should not be shown acting from a mortal motivation of self-perceived weakness. He should always feel "off" and just a little outside of our understanding - even if this makes him seem arrogant. But this is simply how our mortal minds interpret the default elvish position when they try to "translate" it into our own mortal modes of perceiving the world - still there should always be the consciousness and feeling in the back of our minds that we lose quite a bit "in translation" when we try to understand elves out from our own mortal perspective.
Of course we get the Silmarillion stories already "pre-digested" by the mortal mind of Bilbo, still some degree of
otherness,
wonder and
mystery should be preserved when we view the elves, and Thingol especially.
The issue is, we do not really need to understand Thingol for his character to fulfill his function in the story, but we for sure should be
awed by him. And I have the feeling it is the other way round at the moment.
Would you consider Moses to be relatable?
Moses is known to the audience from outside of those stories to such an extend that however one deconstructs him inside of those new stories, one can still not destroy his already generalized legend.
Thingol does not have this general recognition outside of the Silmarillion. While he has such fame inside of Middle Earth, we are still viewing him from outside of this frame and we are losing this his very importance inside of Middle Earth - this importance is simply not being communicated to us in the SilmFilm's story. And if we have to understand the Sindar, we have to get at least partially a glimpse of what Thingol means to and for them.
As for Beleg and Mablung, they were introduced as characters during the journey West in Season 2. They were involved in the search for Elwë (Thingol), and decided to stay behind to try to find him. So, they have been there since the beginning of Doriath, and are quite old. Lúthien and Daeron are from a younger generation than them. The Silm Film characters who have direct experience with running from the Hunter and losing family members to him are Elwë, Celeborn, and Ingwë (his wife died in captivity when he was in Cuiviénen). Both Beleg and Mablung have been involved in fighting since then.
So they were involved in war since just after "Elwë, Celeborn, and Ingwë" had "direct experience with running from the Hunter".
This would make their parents or grandparents having been "fair game" for the Hunter, as this experience does fall into the timeframe of the generations just preceding Beleg and Mablung.
As March Wardens of Doriath, they haven't been doing much hiding or cowering.
They still hide inside the Girdle and do mere border duty or some occasional spy or diplomatic mission. They might find the "extended holidays" inside the Girdle getting a bit "too extended" - they might feel "missing their purpose".
Most recently, they participated in the Hunt for the Wolf, when Beren and Huan killed Carcharoth.
The Hunt for the Wolf was mostly inside of Doriath, this fells well into "hiding". That was a merely reactive and defensive action. Beleg and Mablung might have gotten tired of waiting until the enemy brings the fight to them invading their safe haven - which, as they can assume, will happen eventually - and might wish to bring the fight to him instead.
The Silm Film characters who have direct experience with running from the Hunter and losing family members to him are Elwë, Celeborn, and Ingwë (his wife died in captivity when he was in Cuiviénen).
BTW, regarding Ingwë - how many children has he been shown to have before his wife died? For sure we need Ingwion but Ingwë was told to also have had several others. We would need the Vanyar a little more fleshed out in the build-up and the depicting of the soon coming War of Wrath.