I just think that Binance usually overdoes things if they mean to take from customers.

Remember when I came here to complain about how Bybit was overcharging me for funding fees and other fees I said I didn't know what they were charged for? I moved my capital to Binance, and the fees there were even worse compared to Bybit, so I had to return to using Bybit. What I'm just saying, in essence, is that every exchange has its own collateral ratio attached to those coins in Portfolio Margin.
Based on your own statement, you already know that using stablecoins gives your capital a lower discount, so if you just love using Binance, you can convert to stablecoins, or better still, use Bybit, which you said is better. I get your point.
What is the main difference between the collateral they are giving on both Bybit and Binance?
I would not blame Binance either, as I think they have their reasons to manage funds like this because if they don't apply the safety discount, then they might have to face liquidity problems.
As this discount or cut, you can say, is known as a collateral haircut, and they do it for a great reason, which we can already assume is to save the exchange from a liquidity crunch.
For example, with his $58 collateral, let's say he took $58, which they don't give, but for the sake of this let's say they do. He opens a $200 long position, and the market falls by at least 20%, so his portfolio is down 20%. He will lose at least $40 from his $200 long position, and his portfolio collateral will become at least $46.
The remaining equity is now around $6. So let's say the market falls another 5% to 10%. The additional position loss will be like $10 at 5%, and the equity will become -$3.
Now imagine millions of users utilizing this loophole and crushing the liquidity, and eventually their ceiling will be hit. It is not like they don't have specific liquidity for the deficit. They have it, like they call it the margin insurance fund, which covers it. If we want another FTX collateral issue, then if we read their history, that's exactly what happened there. Their illiquid token issued by FTX was used as collateral for loans to Alameda, and when the valuation inflated, then we all know what happened.
Loans are a curse, bro, so be on the safer side and don't try to exploit the system by wishing to have one haha. These exchanges have learned their lesson already.