I have a few thoughts about halfelves, warcaster, and the oath of the ancients. I present them to you. Feel free to include them in your guide if you seem they make sense. Here they are:
Imo halfelves make the best OoA paladins (gold for OoA), and warcaster is a feat they simply must take at some point in their careers (again gold), even if that point is the 19th level.
A 20 level halfelf OoA paladin, with BB from the proper variant, and the warcaster feat, can make the most out of the Elder champion feature (oath capstone). I copy paste from my other post:
First round of combat: Use your action to activate elder champion, move up to your enemy, use your bonus action to cast command on the enemy, the enemy rolls the save with disadvantage. Command the enemy to flee. If the enemy fails his save, we use BB as an opportunity attack, dealing [weapon die]+ str mod + d8 (IDS) + 7d8 (BB) + whatever other adds to our damage (from spells to magic items). So we inflict all that damage with just our reaction, and the enemy even loses his turn. All at the cost of a 1st level spell slot, and a bonus action. Meaning that we can continue doing that in the following rounds (as long as we have spell slots to use for command), and on top we can use whatever we want with our action (save for casting spells, as we use ourr bonus action to cast a spell). And the enemy rolls with disadvnatage his save. How awesome is that?!!! Even against enemies with legendary resistances, that means that we can very quickly burn through those resistances (due to disadvnatage on saves, meaning that they should fail more often that succeeding), and we can burn through the legendary resistances at the cost of 1st level slots and a bonus action, meaning that we are still attacking with our action.
Can we do any better than that?
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Anyway, as I said, food for though.
ps: I have put some thought in paladorcs. It would be very tiring to start this discussion from the beginning and start explaining how to best create a paladorc, but imo they work best as S&B builds who can both tank and provide support and healing exceptionally, and warcaster and the most important feat for such builds (ie gold for paladorcs). Maybe I can find some older post regarding this and copy paste it here to discuss it, maybe not as it is about a very specific multiclass option and not so general as it would maybe fit the guide better.
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Oh, and something else, I was thinking of oathbreaker builds. I think you should mention that sentinel works well with the dread lord feature, in the sense that it can help you keep enemies within the 30 feet radius of both the dreadful aspect and the dread lord aura, thus they keep taking damage and are not allowed extra saves against the frightened condition. Sentinel also works well with poleram master, and as you already very well know that polearm master works really well with paladins (as it gives them a way to use their bonus action and reaction for damage, applying extra d8's from IDS and possibly from smites), moreover ot works even better for oathbreakers with the aura of hate adding extra damage on the butt end attack, that all makes me think that any optimized oathbreaker would definitely take polearm master and sentinel (as anything less than that is not optimised imo). Ah, forgot to mention, polearm also gives you reach, meaning you can attack your opponents from 10 feet and of they are frightened they cannot approach you, so if they have good melee attack polearm master becomes even better. As I said, I dont believe that there are optimized oathbreakers without both polearm master and sentinel in their final build.
As for the encounter when you use the dread lord feature, I believe you described it the other way around. I would use the dread lord feature with my action during the first round, move to position myself appropriately so I can have many enemies close to me, use my bonus action on one of them with my spell attack granted by the dread lord feature (3d10 + cha). In the second round, I would use dreadful aspect to frighten the enemies (that is why I positioned myself in the previous round), and use my bonus action again with the spell attack. At third round I would use my bonus action to cast wrathful smite if there was an enemy that succeeded his saving throw, and move to him to attack him and attempt to frighten him as well (more frighten creatures means more damage from the aura). If there were no creatures that were not frightened, I would simlply use my attacks with my polearm, and my bonus action with the spell attack (which is slightly better than the butt end attack, even with aura of hate on it).
I believe each oath plays differently than the rest, and you should look to give different ratings to races, feats, spells, etc according to which oath you describe (you have done this up to an extent ofc, eg GWM with OoV, though I think it goes deeper than that, as I tried to show with my examples).
Imo each oath favours a particular fighting style, and hence feat selection, more than others.
ps: An optimised oathbreaker relies heavily on scare tactics. It is funny how from a fluff perspective an oathbreaker is supposed to be the anti-paladin, but from a mechanic-perspective any paladin with aura of courage (and good saves before that) is an anti-oathbreaker. Perhaps that fits the theme though, as who better to bring down an oathbreaker than a paladin?