The position matters because ...
For one you dont want a rear hub drive if your on aggressive trails and bike parks as the weight of the rear wheel is massive especially when jumping and moving the bike around in the air
Its much better to have the weight in the centre and low down on the bike
Also rear hub drives are hard on wheels and spokes as it is with out factoring in drop offs and table top landings and super rough trails
You also have the feel of the bike which is much more natural with a mid drive than any hub drive i have ever rode
This is why i said "Serious about your hobby" which i should have probably re worded as Aggressive with your riding style
Hope this makes my comments clearer
And dont forget this is only my opinion Yours maybe different and thats fine too .
And your comment " If you were serious there wouldnt be a motor "
Really I treat it like my up lift especially at bike parks
You also see Pro downhill riders using an uplift Just in a different form
So what make an EMTB a non serious thing ?
Also you might want to take that up with the Ews-E as they seem to think there sport is serious .