The default graphic tool is to much simple and multiple times doesn't help to identify situations since they aren't interactable, like see the values when pass the cursor over the graphic. 
Please, not use the graphic of the wigdet , it's horrible.

Search for any other, lighter and faster (I already see theses graphics in tools like Grafana and Home Assistant plugins).

Add the option to select which graphic tool want to use as default , this way you don't remove this default graphic and open options for newones... maybe futures plugins...

Per example a situation where a new graphic tool could be useful.
When we select multiple items on "last data" screen and click to see the graphic , if we select itens with different unit, per example check a performance issue , looking for a item with ms unit and a cpu%  , they put everything togher on the same scale, which is uselesss, there is no option to change dynamically the scale or left/right scale for each item , separating the unit scale...

The new graphic tool should be able to allow change this dynamically.