Do you actually believe that a vagina can actually be "loose" or "tight"?

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No no no. The vagina is a muscle. It doesn’t get loose from life or sexual activity. That would be like your butt getting loose because you take a shit everyday. That is not how muscles work. 
Yes, childbirth can change the vagina, but for the most part, that is temporary. Your vagina will return to its pre-pregnancy state. It takes nine months to grow a baby; it can take some time for your body to recover as well. 
All of that said, trauma can change vaginal tissue in particular tissue and muscular tissue healing and scarring. In these cases, a person should be referred to a physical therapist who specializes in pelvic floor recovery.

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Does your mouth get bigger or tighter?  If I hold my mouth wide open does it eventually just stay open forever?

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No arguing science.

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I think it is what it is. The size it comes in is just what it is and it’ll feel different to different guys. 🤷‍♀️ I think it’s dumb to spend time worrying about being too loose or wanting to be tight. It’s a vagina

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It’s sort of like penises... they come in different shapes and sizes, but they are relatively close... there’s not a huge difference. It is also a muscle, some are weak and some are strong

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Let me put it this way, if mine is "loose" whatever you're doing to it is working. If it's still tight and dry then try something different.

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The vagina is a very short very small area, when aroused a women will get looser and her vagina will get longer to accommodate for sex. Then it goes back to normal. If a women is “loose” it just means she’s aroused

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The only way anything even close to that happening, would be if they had atrophy.

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I think of a vagina like a penis. Long, small, average,girthy, not girthy, and average girthy. 
Someone's thing work for other's thing more. Your size is relative to your partner's size. 
As far as loose pelvic floor- yes. Men and women can strengthen their pfm.