Well, as continued feedback - I had trouble actually parsing or understanding what you were suggesting in your explanation, and that's not a good sign. It still sounds as though, whether I'm deferring things or not... I cannot do as I should be able to in a single combat round, which means that while I'm still trying to take my three attacks on three distinct enemies in different locations all within my single normal movement speed, a second turn will begin and ensure, and everything else will just get to do more, while I'm still trying to do what I should have been able to do in one go... or am I not understanding correctly?

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Flexibility comes in in situations where timing comes in to play. Currently if there isn't someone standing under a bolder that can be dropped by shooting a rope on your combat turn you can't wait for them to walk under it and then fire.

5e has the 'Ready' action for this exact type of flexibility - you can ready a specific course of action, an attack, a spell, using an item or interacting with someone or something in a specific way, and then nominate a trigger: so in this case "I want to shoot the rope when the biggest hobgoblin runs under the boulder". Then, when the biggest hobgoblin does, you can shoot and release your readied action, or, if it's no longer appropriate (Say, the biggest hobgoblin has actually raised a truce flag and is now walking forward to parley), you can choose not to.

BG3 has not implemented the ready action into their game, but many people are saying that they need to, along with a functioning reaction system.