Why IV belongs in a scenario tool
A stock move alone is not always enough. If implied volatility also expands or contracts, the option can move more or less than Delta by itself would suggest. That is why OptionsPeek includes both current IV and target IV assumptions.
The point is not to turn every user into a volatility specialist. The point is to give a realistic way to ask, what if the stock moves and volatility changes at the same time?
How to think about it simply
Current IV describes where volatility is now. Target IV lets you model where it might be after the move. Vega tells you how sensitive the option is to that change. Together, they let you estimate whether volatility is helping or fighting the stock move.
This is one of the areas where scenario planning is more useful than a single static quote.
Useful future images
A strong blog image here would be a clean chart or calculator screenshot that compares the same stock move under two IV assumptions. That makes the effect of Vega visible immediately, without needing a long explanation.
Because the blog is static-first, those assets can stay local and be dropped into the post whenever they are ready.