Canada

I think there’s a disconnect of what people mean by fast and slow here. A slow cyclist is still going at 15km/h, and 30km/h isn’t even that fast,

What's the context? Country bike lane or urban trail? 30km/h on an urban bike trail is too fast. That's why places that do post speed limits for cyclists often have them at 20km/h or slower.

Whereas electric wheelchairs are optimized to move within walking speeds, so about 4-6km/h. Having someone move 5km/h share space with someone going 20km/h+

I disagree. If you've even been in a sufficiently wide bike track, you'll realize there are no real conflicts.

The issue is that very few tend to be very wide, so any conflict is a result of the design, and not the concept.

is like having roads that share 60km/h with those going at 20km/h.

Yes, a single, narrow road in that scenario would create bottlenecks. Although, this is common on roads where farm equipment is used.

The more accurate comparison would be a multi-lane road where slower drivers are on the right side, while faster drivers are on the left. They have enough width over those multiple lanes to avoid conflicts.

We're asking that bike lanes be sufficiently wide to also avoid conflict.

Not to mention that some bike lanes are actually too narrow for wheelchairs to fit.

100% agreed. Too narrow for bike trailers, cargo bikes, trikes, and mobility scooters.

That's why we need laws that make it mandatory to have WIDE lanes for these users.

there’s entire sections of the city that have zero side walks as well, but those areas also have zero bike lanes despite allowing cars to go 40km/h or even higher.

We have a few places like that around here. It's unnerving to say the least, and I wish they were only going 40km/h... I've clocked cars and large trucks going well over 80km/h (in 50km or 60km/h zones) as I white-knuckle through on my bike.