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> それでいいですよ。

I assume this translates to something like "That is good".

But why is それ marked by a で particle here instead of, say, a が or a は
particle? It seems that それ is acting as the subject of the sentence, no?
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2022-07-30T16:58:24.073
95612
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nuances particles particle-が particle-で
Why is それ marked with a で particle in "それでいいですよ"?
This is a very interesting example of the difference usages of が and で.

> それでいい

In this usage, で means something to the effect of "That thing is good enough."
"It's okay." "We don't need anything better than that. We will make do with
it."

> それがいい

This usage is a typical example of が being exhaustive listing. "THAT thing is
good." "THAT is what we want."

So for example if your spouse asks what you want to eat for dinner, you may
say 昨日のカレーでいい. "Let's just have yesterday's leftover curry." You could do with
other options, but you don't want to bother. Curry is okay. If you say カレーがいい,
you mean you really want to eat curry and that is the thing you want.
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2022-07-30T19:32:26.087
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I personally tend to think of で as the "context particle". Another way of
thinking of it is that a lot of the time it equates roughly with saying
"with/using". So, with that interpretation, what「それでいい(です)(よ)」is actually
saying is:

"In the context of that (それで), it is good (いい)"  
or  
"with/using that (それで), it is good (いい)"

That is, it is not saying that the thing itself is good (それはいい / それがいい) as
much as it is saying that if we look at other things in the context of that,
or do things using that, or apply that in some way to the situation, then
things (in general) will be good/sufficient/etc.
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answer