Honestly, everyone makes good points. Unisex tend to be better. Yeah, womens bikes have lower standover. You're really too tall for the womens bikes, it depends more on arm length.
I'll add one more. I'm 170 cm, that's 5'6.75". My inseam is 33.3". And I have long arms. So long legs are relative. Women's mountainbike have too low a standover for me. Also. Too short a reach. Too narrow bars. I think the bike fitter said my shoulders were either 42 or 43 cm. Shrug. I"m the smallest person in my family. Sister is 6' tall. Brothers are 6'1" and 6'5. So I'm itty bitty compared to them.
I need a bike with a steep seat tube because I have difficulty with too much setback. I have a long reach, and that makes the bike's reach shorter. I need a higher stack due to a short torso. I just ride the bikes I want and don't worry much. I know how to adjust them properly. My medium surly karate monkey would be better with a higher head tube. But it's pretty good. It has a steep seat tube, and that is my main requirement for my knee's sake. (According to most mountainbike size charts, I should ride a small. In reality, I could ride a large, though I suppose the handling might be a little wacky).
When fitting a bike, the first place to start is your position over the bottom bracket. So first question: do you have long femurs in proportion to your overall leg length and so need a slack seat tube and maybe an offset seatpost? Or are you more centered over your bike with a steep seat tube? Do you always want your knees to be farther forward? For example, a Karate monkey has a 73 degree STA, but an All City Electric Queen in size medium has only 71.5 degrees. Probably too slack for me or I'd already have one.
The rest of the adjustments go from there. I can't imagine any bike that fits you would have a too short seat tube for your leg length. That is definitely a problem for me, though. I do notice the size large bikes tend to have a lot less standover than I am accustomed to, so it's a little hard for me to judge.
Oh yeah, bike stiffness. I used to be a professional ballet dancer, have been a cyclist since childhood, and have a mesomorph body type. So my legs are strong. Womens bikes have too much flex. Especially as I ride larger bikes than most women. Noodle time. No thanks. The Pinarello in my signature has a bottom bracket that does not flex. And it's perfect for me. The power transfer in the CAADX is prime, too. The bigger the bike, the more it flexes. So a true women specific bike that fit you might be very flexy.
Big BMX? That is what you want? Plenty of stuff out there like that. Karate MOnkey time. But I'm biased.
I'd really love one of these All City EQ's, but I'd need to test and see about the slack seat tube. Seems most people actually prefer that. And I know of people who have them. Snappy and light is how they describe them.
https://allcitycycles.com/bikes/electric_queen