A bit off topic, but why hasn't the tech advanced too much in the RTA/RDTA area? I tried juul, but pods are just not for me, they produce too little vapour and

A bit off topic, but why hasn't the tech advanced too much in the RTA/RDTA area? I tried juul, but pods are just not for me, they produce too little vapour and feel awkward to use. I've been using Creed and Zeus atomizers since I started and they are really low tech with lots of issues, they leak juice, the airflow is not ideal, sometimes they burn the coils too quickly, no one knows what the ideal wick size or thickness is and so on. I sometimes wonder, if the potential market for vaping is so huge, why are there no better products with better designs? I feel like there's a lot of simple/easy fixed to improve them.