Yes at a minimum, more if possible = )_
Everyone in this thread has their own reasons, some are for elite status of RC ebike build, some may want motor for RC use, some want the power to pull hills without slowing down or haul cargo or even to go highway speeds... My reasons are quite simple, hp to weight ratio is directly related to the safety of light vehicles in my mind.
If you think about it... 6000w is really just 8hp of output power, my old gocarts used 8hp motors. A motorcycle (My Katana GSXR 750 is 129.1hp) and weighs in at 359lb - add rider @ 170 and total weight is 529 without any additional cargo. My bikes weigh about 225lb without a load but with rider (me).
This works out to:
Katana 750 HP to Weight: 4.1hp per lb
eBike (6kw) hp to weight: .035 hp per lb
eBike (750w US legal) hp to weight: .0044 hp per lb
Now when comparing power to weight ratios, do things make more sense in grand scheme and scale?
Most people want to cruise along with traffic which means a bike capable of 25-40+ mph, they may not use the available power at all times (I don't) but they will (especially with my terrain/hills) eventually need the extra power (I do).
If you add weight of cargo or anything else (don't forget your helmet, bags, laptop, spare clothes) you further decrease power to weight ratios...
I suppose I want a bike comfortable and efficient at 25 mph but also able to hit 45 top end when needed, I would want more power on tap because if it could be kept streetable... well there's no substitute for being able to "get out of the way of danger" and you need available power to accomplish this. I could never pedal 225lbs of me and bike fast enough to avoid a car coming at me but my bike (when used within it's speed range) is actually quite nimble and easily able to "jump" out of the way as needed. This has saved my bacon on more than one occassion and my top end is only around 3kw now... the issue here becomes not jumping out of the way from a dead stop but at 25mph, being able to jump quickly to 45 to get out of the way.. for that I need higher RPM and more top end power to sustain speeds.
2010 Dahon Jack - GNG v1 - LYEN 6FET - 20/40A - 18S2P10AH - Nom:66.6v,1332w
2004 Hard Rock Pro Disc - Recumpence ms eDrive v4 - Astro 3220 4T - 12S2P16AH - HV110 - Left Side Drive - Gearing: 38mph
Nominal Peak Power @ 60 seconds: 5328 watts - Maximum Power: 49.8v, 120A, 5872w
2010 Downtube 8FH - Stock GNG v1 Stock Controller - EB809XC - 12-16S
2012 Downtube Nova 7spd - Stock GNG v2 - 12S2P10AH - EB809 - 12S-16S - 20A/30A,Nom VCC: 44.4, 888w