Neil Williams wrote:

That said, the vehicles causing the biggest disruption to bus
operations are taxis which frequently stop blocking bus lanes.

That seems incredibly unlikely, because taxis do not frequently stop, but
buses do, so taxis very rarely have buses behind them to hold up. The most
likely way for a taxi to get immediately in front of a bus is to have just
overtaken it, in which case the road is probably free-flowing and the bus
will have no difficulty re-overtaking the taxi. The only exception would be
where the taxi was loading or unloading a wheelchair, so next time you are
in a bus held up by a taxi, look for the taxi's boot open and/or wheelchair
ramps deployed. How often does this really happen, and in which road do you
find it to be a regular problem? (not a rhetoric question, because I can
think of no place where it happens).

The biggest obstructions to buses are pedicabs riding, pedicabs parked in
bus lanes, and other buses blocking box junctions.

I
believe this is permitted, but I strongly believe it should not be
permitted for any vehicle other than a bus to stop in a bus lane for
any reason other than mechanical breakdown, at any time.

You haven't thought this out at all. Bus lanes almost always briefly stop
before any junction where cars are allowed to turn left. Your plan will
force taxi-hailers, some of whom are disabled taxicard holders, to walk to
these spots where the taxis will be able to pick them up. The tourists (and
indigenous population) will not understand this, so the taxis will end up
waiting at these spots for the punter who hailed them 200 yards back to
walk/hobble/wheel to the taxi. This will cause stopped taxis to become an
impediment to buses and other taxis, which IMO they are not now: it will
also make it harder for cars to turn left into side roads, because the
turning left lane will always be blocked by taxis waiting for asthmatic
tourists to walk to them. So, what a terrible idea!