I was going to ask if maybe it was Sena's 'audio engineering' (LOL) skills but it sounds like this is a more generalized issue.
I really want to know details on this studio, and any connections to people at SE.
So Sena wouldn't be submitting vocals personally, not outside of the pandemic. Y'shtola was a special case where she was recording from home due to maternity leave (not that the character had any reason to be in the story, but that's a separate issue). The same recording setup would be used for Sena as the rest of the US cast.
Like the moustache-twirling Goebbels character. You know: the one voiced by Koana. Because his VA has literally one voice. And this is like the tenth character voiced by him. I want to point out that Gaius van Baelsar in ARR is the voice of Bobobo Bo Bo-Bobo. But that's also besides the point.
In the funeral scene, there are what sounds like London accents and the LA studio. Unlike in the main game, it sounds like someone was monkeying with the master to make them sound... loosely like they were recorded in similar rooms. Now in an ideal case, you professional studios have access to the same mics so they can coordinate on which ones to use for their actors - and on what size of room to use them between. For example, I use a Rode Nt1 nowadays, which is a condenser mic. Before that, I used a Blue Yeti, which was a dynamic mic. These two mics produce very, very different sounds, and the room you use them in further changes up the way that they sound.
You don't need to have the exact same mic to avoid this issue. But you probably are looking for the same type of mic and a similarly-sized room, which they didn't do in base dawntrail. Even that wouldn't have been an issue if an audio engineer had been given both masters, such that they could tinker with them to get them sounding at least roughly the same. And I wager most people didn't hear the difference in audio quality in the base game, tbh. When I was looking through old quest cutscenes, I found that Minfillia peaked the mic... fucking constantly. I just couldn't hear it when I played through originally because I was less aware.
Of course, you naturally avoid this by having everyone record in the same studio - and given that there was no fucking reason to split the VA work to US-UK except for nepotism (no other localization seems to have split it), well... yeah. God, I also love that for all the 'cultural consultants' they brought on, the only food in the continent is tacos, and the literal first quest of the patch is HEY WANT TO EAT SUM TACOS??? MMM I LOVE TACOS TACOS ARE SO GOOD
The issue with the funeral is that the reverb effect applied... sounds awful. It sounds really amateur. It's applied to both the US and the UK case, which admittedly does normalize them so it's hard to really hear if the original recordings have the same variance in studio setups... but the fact that it sounds like a stock plugin is the problem. And then there's that fucking typo which... literally any QA team would have found, if the QA team had been working. Sure, it's more important to get the dungeon and alliance-raid working properly -- but you don't need more than an hour or two to have someone proofread the fucking cutscenes. This typo's gonna get hotfixed in a day or two I bet. But the godawful reverb is gonna stick.