I think the main and most alarming considerations for the disadvantages are:
1.- To enter a position you must choose to enter only with Stop Loss, or not place Stop Loss but Take Profit.
2.- That do not allow entry through Margin Trade, but simply to trade only in the bull market, that is, only buy currency and wait for it to increase to obtain profits.
There are many level 1 exchanges, which have these disadvantages, in the case of (1.-) you have to choose between entering with Stop Loss, which forces you to stay on the chart as long as necessary to see if it arrives to your profit, I think this is not good for the trader , because it creates dependence and much more stress than normal. And if it enters placing the Take Profit and does not protect with Stop Loss, in less than 10 seconds the market can come against, and if you are not in the graph you can move to a very losing position.
For the case (2.-) we know that the market corrects, and many exchanges do not allow entries in Margin Trade, which limits the ability of the trader to trade with the freedom it deserves.
Well, it depends on the trading platform you are using or the exchanges you are using, most exchange now have upgraded and does allow entry into margin trading and if I may understand you clearly, are you saying most exchanges does not have facility for stop loss in trading which I believe is not true, there are couple of exchanges available that allow stop loss though some of them don’t allow this because it reduces their profit but I can confidently tell you that Binance, poloniex,coinbase and karaken allow this tools.
Well, I mean open a position: Stop Loss and Take Profit at the same time. I understand that only Bitfinex and Bitmex allow it, previously Kraken, but Kraken no longer owns it.
Why do I say it? If I enter a position with Stop Loss, I must be waiting on my PC until I reach my goal, if I place it automatically, it should not be pending on the graph, and what will happen if I lose, simple I assume my loss and if I win excellent But both they are only in Bitfinex and Bitmex. In poloniex, you can also enter a margin, but you do not have: Stop Loss and Take profit that can be set at the same time ... Only Stop Loss or Take Profit.