Remathilis
Legend
Your analysis kinda shows that warlock isn't as beginner friendly as you made it out to be. Your spell swaps require a certain amount of optimization analysis (determining if upcasting a spell is better than getting a new one) that many newer or casual players don't always have. I intentionally avoided optimization for that very reason. (The other reason was an attempt to try and find options that were shared between both versions).The thing here is that I don't think many people are claiming that the 2014 warlock is broken-good. Decent, yes. Broken-good when compared to e.g. the wizard, no. And I don't think your D&Done warlock is in the league of your classic one.
Anyway, build critique:
So our 7th level "classic" warlock might instead know Hex, Misty Step, Blindness/Deafness, Invisibility, Fly, Fireball, Counterspell, Banishment. (The only one of these spells that doesn't scale is Misty Step); I don't think that this caster is any less well rounded than either of yours. And this ability to dump their out-leveled spells is one of the reasons the warlock doesn't lead to as much analysis paralysis and reading through spells a little lost as other casters.
- Armour of Shadows for the 2014 warlock with light armour is at best a "style invocation". When you can wear light armour for Dex +12 spending an entire invocation for Dex +13 is a waste. (It's even worse in the D&Done warlock where you can wear medium armour or even just spend a first level slot for Mage Armour). This is literally the worst invocation in the entire playtest packet; Fiendish Vigour (False Life At Will) is a far better choice if you want an invocation to make yourself tougher - and it doesn't have great scaling.
- Scorching ray barely does more damage than a two-bolt Eldritch Blast and it does the same thing.
- Arms of Hadar was a fine warlock spell at level 1 - but the upcast version is awful. It should be traded out for Hunger of Hadar at level 5 or 6
- Likewise Burning Hands for Fireball
- Not that you need either both Arms of Hadar and Burning Hands or Hunger of Hadar and Fireball as your messy AoE of choice.
The reason you'd do that is if you wanted to cast banishment four times in one fight. The warlock can't do that; part of the point of the warlock's mechanics is to cap their ability. And all Banishment really is in most cases is a save-or-don't-be-here spell. It's a spell to bring down on a boss monster.
I'm sure the char-op boards could easily build a better warlock than I did. Tbh, I wasn't trying. Only to give an example of what a similar character might look like in both versions.