Disengage is not a new invention, combining it with jump is the only new thing there (which looks pretty stupid, but I digress). Also, at the current state of EA you don't really need an "idealized" caster to take down an idealized fighter, you could literally pull it off with three cantrips: Acid Splash to reduce their AC, Firebolt to set them on fire constantly, and Ray of Frost to knock them prone over and over. Is this an idealized caster? Of course not, it's just the simple and glaring issue that Larian made cantrips so OP that a caster can easily take down a fighter with the way they changed rules around. A cantrip that sets the enemy on fire even if it misses? That's free damage, no rolls even required. One that reduces AC just be making a giant pool of acid in an area? A free way to reduce AC, which is a HUGE deal. And finally one that knocks enemies prone more often than not, slows their movement range by 10 feet, and creates a rough terrain surface that can also knock them prone and reduces their speed yet again? Good grief, casters don't even need to use spell slots with these cantrips available. That's not even an exaggeration, I have gone through several combat encounters without even realizing that Gale (the companion wizard) had no spell slots left because his cantrips are so OP I almost never use regular spells.
The context isn't in a 1v1 situation, the context is in a group where cantrips makes every class obsolete or non-competitive.
Do not forget that cantrips still take one action, so weigh that against every spell that you have in your arsenal and if you would rather cast cantrip over 'big hitters' like web, grease, ray of fire, magic missile (with the amulet), hold person, under every condition then it's clear that adjustment needs to be made - that would also be true if the majority of your scenarios show that opening or spamming cantrips is more efficient than using spells.
Furthermore, keep in mind that most of the time unless you're meta gaming, you'll be reacting to ambushes in this game which means you're probably going to be splashed with acid and you're probably going to be swarmed. Or you may be in a DPS race.
