Warlock Gaze of Two Minds questions

Quote from jl8e >>

You're drawing a distinction between casting a spell and the spell's effects. It's unnecessary. When you take the game action of casting a spell, if you can fulfill the requirements, the spell's effect happens.

If the spell effect is not separate from the casting, you can Counterspell an ongoing spell after it has been cast.

That is not possible because the spellcasting ends and the spell effect starts afterwards. Two rounds into Wall of Fire, you are not casting a spell, the spell casting has completed. The spell effect is being resolved. It is easier to blur the lines with Instantaneous spells, but spells with a duration highlight the distinction. You have to complete the spell casting in order for the spell effect to occur. 

Quote from jl8e >>

Now, you're defining the ability out of existence. If you don't even project the ability from the gazed creature, it's barely different from casting it from your own position. Range still applies from you. Obstacles still apply from you. It's pretty much down to situations where you can't see the target, but there's nothing that blocks the spell. That's not much of an ability.

I was not the one who defined the ability as such. Also, please note what I said was my opinion on the intent:

Quote from SmiteMakesRight_3_5 >>

I think the intent is that you are able to target, draw lines of sight, and maybe even lines of effects from the Gaze target's location, but any physical interaction, such as touch and weapon attacks can only occur from your own space.

I am not certain about lines of effect, such as Fireball and Scorching Ray. However, as it is written, it is restricted to targeting and line of sight only. This may or may not be intentional.

You could cast Misty Step to teleport 30 feet (from your original location) to an unoccupied space that the Gaze's target can see (though this would end the effect as you could not extend it another turn).

The ability gives you the ability to see with the senses of another creature and casting spells using that sight is already strong, depending on your senses and the target's. If you have Devil's Sight, it's less valuable. If you don't have any Darkvision, it can be more valuable.

If you are using it to nuke around corners without endangering yourself, I can understand why you would complain about a different interpretation that actually requires you to be in danger while attacking.

Quote from Unilythe >>

.... It simply says you cast a spell as if you are somewhere else. The weapon attack from booming blade is explicitly part of the spell. You therefore are still pretending to be somewhere else when you make the weapon attack.  

Where is the weapon physically located and who/what is swinging the weapon?  If the GOTM creature has the weapon, who is controlling their actions?   The PC can't attack for the creature.  If the PC has the weapon, then GOTM is basically irrelevant as the weapon range is based on the physical location of the weapon.  Which is in the PCs hand.