Panoptix is fantastic but has its limitations as all pieces of tech do.
Target separation in down view is as good as my LX-6 so no issues there.
Is it necessary? Of course not but it is extremely valuable in minimizing the learning curve on new lakes especially in the winter where movement is not always as easy.
What it is not good at..
Finding walleyes or bottom hugging fish in forward view. It can be done and becomes easier in deep water but it is still not great.
If you are a primary walleye guy livescope seems to be the best option as it is easier to see bottom movement but it does come with draw backs for hard water fishing as the unit likes power. Most guys get around this by running two 10ah lithium batteries or one 20ah. If you run the 20ah you have to modify your carry case slightly to hold the battery in.
If you have more questions on panoptix feel free to ask and I will answer as many as I can.