Calling Portland "dense" is hysterical. As a Portlander, I can say we are a terrible example of what NIMBYism does to efforts to lower housing costs by adding density. Our city has a decent public transit setup and if the focus was on adding usable density with improved transit options, rather than people trying to protect neighborhoods, we'd be much better off. I am fine with Lyft wanting this regulated at the state…
“Less dense than than optimal” does not imply “density effects don’t matter for city management as claimed in the letter [eg for scarcity of road capacity or pickup points]”.
The other problem is that the commute pattern in Portland isn't into downtown only. There are people who commute from the east side of town, through downtown, through the tunnel (or one of the other limited transit options over the hills) to Beaverton or Hillsboro to work at Nike, Intel, etc. The efficient public transit options for that commute simply don't exist. It can take 1.5+ hours to do that via MAX and bus.