Aloy is much preferred as a Burst Support over Main DPS as getting coil stacks for her Cryo infusion can be quite unreliable. Aloy needs 4 coil stacks to get the Cryo infusion and you can only get 1 stack every 0.1 seconds which is quite hard to do considering the Bomblets are scattered all over the place. One thing to note regarding Aloy's coil stacks is that **she can still get coil stacks even when she's off-field.
Aloy is very niche as she only performs well in certain comps and even then, she's still completely replaceable by other characters. She can be utilized on a Freeze team where she can be a battery and nuke at the same time since she provides 5 Cryo particles on her Skill. She can also be utilized on a Melt team where you can Melt her Burst for quite a decent amount of damage.
Regarding Weapon Choices:
Polar Star: Forcing to get stacks isn't worth due to consuming extra time to get those stacks.
The Stringless: Placement assumes Aloy is used on a Reverse Melt team. On Reverse Melt Aloy , especially at higher refinement levels, can pull ahead of .
Prototype Crescent: Assumes the passive is active by proccing a weak point shot. This weapon especially at higher refinement levels can be as good as .
Sacrificial Bow: A pretty decent option to make Aloy a Cryo battery as her Skill provides 5 Cryo particles.
Regarding Artifact Choices:
Sets
Blizzard Strayer (4): This artifact set is best used on a Freeze-focused Aloy as it provides a ton of Crit Value.
+80 EM set (2): This artifact set bonus only benefits a Melt-focused Aloy, Elemental Mastery provides nothing on a Freeze Aloy.
Noblesse Oblige (4): Aloy is one of the best (4) holders since she has low energy requirements and cooldown for her Burst.
Main Stats
Elemental Mastery: Elemental Mastery is only an option if your Aloy is played on a Reverse Melt team as it provides nothing to a Freeze Aloy.
Substats
Elemental Mastery: Only an option if your Aloy is played on a Reverse Melt team as it provides nothing to a Freeze Aloy.