New player 4* tier list

Now basically I made this list because although the value of operators are somewhat relative to your account, just about every tier list on this website is TRASH. So without further ado, this is a
Tentative approximate ranking of low rarity operators based on their role effectiveness, minimum investment, ability to fill important niches and how hard they are to replace across all content, from the perspective of a newer player, in short; your expected ROI from building them. Operators should be compared with others in their role/function (arts dmg, anti-air, lane holding) or within their class/trait, and not strictly between tiers.

Minimum investment:
how much investment an operator needs to properly function. An operator that requires more investment generally leads to a lower rating, with the caveat that some of these operators are some of the strongest among the 4*s once they get their E2/module.

How hard they are to replace:
How abundant/available stronger options in the relevant role/niche among higher rarity operators. I.e: Pinecone and Ethan has like a singular replacement each in the entire game, while Purestream and Windscoot have free operators that replace them, with Purestream still seeing use in IS.

Terms for the uninitiated:
IS: Integrated strategies
Leaking: Enemies getting past your ground operators.
S1/S2: An operator's skill; 1 or 2, as seen from left to right in their operator info.
Slvl: Skill level
Pot: Operator potential.