> If you have been on both buses and trains it should be obvious.
It's not that obvious if you've been on a well-done BRT line. The design characteristics of busses that you mention don't hold true universally—in particular, on quality BRT lines, the busses are typically designed to feel very much like the interior of the trains people like. I'll give you acceleration and deceleration comfort in general though.
> Somehow it still baffles transit planners that people might care about the subjective experience of being in transit rather than the throughput or cost.
It baffles me that people think transit planners control vast sums of wealth and are never forced to make tradeoffs due to cost considerations :-)
In all seriousness, if cost were no object, I'm sure we'd all love trains. The reality is that even hyper-premium BRT lines with dedicated exclusive right-of-way and premier station design are cheaper (way cheaper) than building rail infra.
EDIT:
> How the auto industry hasn’t made that blidndingly obvious is beyond me.
The auto industry relies on there being a huge government subsidy to maintaining the infrastructure that their product rolls around on. Nobody ever said cars don't deliver a nice experience (at low levels of congestion). The problem is that we tend to have too many people driving on roads that cannot, due to laws of geometry, space, and time, accomodate that demand.