Yeah, sorry, I should have linked diegetic essentialism.

The easy example I've seen used is Vampires and Werewolves.

How do you kill a vampire?

Vampires are not real.

Within the fantasy world vampires can be understood in their relation to their 'in universe' opposite: werewolves. They are essentially the same creature: 'monster that bites you and you turn into one'. Vampires tend to be rich or aristocrats with massive amounts of control over other creatures, environment, etc. Werewolves are poor, often homeless, and lose control over themselves in a bestial form.

How do you kill a vampire, a monster representing wealth, greed, etc.

A simple wooden stake, the tool of peasant farmers.

How do you kill a werewolf, a monster representing poverty, desperation, etc

A silver bullet, a weapon literally made of money.

I don't think it does unless you reach some odd answers. The answer could be "to create a world that feels real and inclusive." A big part of world building is describing places and characters so those descriptions do matter and are not just made for no reason. I don't need to justify some convoluted way that a healing spell doesn't work.

I think we agree though (?), because if a player asked me so bluntly it would probably require a pause to talk it out at the least, and tbh that's on me for trying to be pithy rather than adding a sentence to clarify.

Yeah, Action Surge can do two leveled spells.

The action you're taking is Casting a Spell.

Attack is a different action which would let you attack twice with Extra Attack.

You cannot Booming Blade your attacks with Extra Attack.

This is actually the topic of a Sage Advice:

Can you use green-flame blade and booming blade with Extra Attack, opportunity attacks, Sneak Attack, and other weapon attack options? Introduced in the Sword Coast Adventurer’s Guide, the green-flame blade and booming blade spells pose a number of questions, because they each do something unusual: require you to make a melee attack with a weapon as part of the spell’s casting.

First, each of these spells involves a normal melee weapon attack, not a spell attack, so you use whatever ability modifier you normally use with the weapon. (A spell tells you if it includes a spell attack, and neither of these spells do.) For example, if you use a longsword with green-flame blade, you use your Strength modifier for the weapon’s attack and damage rolls.

Second, neither green-flame blade nor booming blade works with Extra Attack or any other feature that requires the Attack action. Like other spells, these cantrips require the Cast a Spell action, not the Attack action, and they can’t be used to make an opportunity attack, unless a special feature allows you to do so.

Third, these weapon attacks work with Sneak Attack if they fulfill the normal requirements for that feature. For example, if you have the Sneak Attack feature and cast green- flame blade with a finesse weapon, you can deal Sneak Attack damage to the target of the weapon attack if you have advantage on the attack roll and hit.

Also, you actually can use Booming Blade twice in one turn because its a cantrip. The limit for spells cast only applies to leveled spells. The easiest way to Booming Blade twice is the Sorcerer metamagic Quicken Spell.

If characters in a story have a disability the question should be "What is the DM/Author trying to say, and how does this character add to the world they are portraying?" The plague of diegetic essentialism etc.