Yeah that can be really frustrating - one thing to point out is that sometimes such companies may be vague about tech stack (or list lots of different languages) because what tech you know isn't as important to them as, say, culture fit, business domain knowledge,etc.
Of course, this isn't the case all the time, but I've found it to be many times in my job searches.
And if the job posting itself is vague aside from tech stack, I've found that to be a red flag haha. I've found that companies that 1) know what they're looking for 2) know how to communicate that are usually better ones to work for. And I move on from the really vague ones
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