I'm curious to know how many of those 28 million visitors were there for the San Diego Comic Con? It's now the Cannes Film Festival for geeks.
Difference being that I happen to live in SoCal and have been here since 1987 (going on 37 years). So yes, I do know a thing or two about San Diego that you obviously do not -- I have actually worked on projects in that City
"Tourism Industry Facts- 2022: San Diego hosts 28.8 million visitors each year and is a top U.S. travel destination."; "Destination Vancouver says — in 2022 — the city hosted 8.8 million overnight visitors". The difference doesn't seem to reconcile with your thinking -- again throwing darts while blindfolded.
"The Los Angeles—San Diego—San Luis Obispo (LOSSAN) rail corridor is the second busiest intercity rail corridor in the nation supporting commuter, intercity, and freight rail services. It stretches 351- miles from San Diego to Luis Obispo, connecting major metropolitan areas of Southern California and the Central Coast." -- until very recently interrupted by the San Clemente landslide during the exceptionally heavy rains. Facts don't seem to be your friend!
I actually wonder how these visitor numbers are counted. San Diego International Airport counted around 15M passengers last year, and one can safely assume a lot of them are just layovers and connections. (For context, YVR had around 25M passengers in 2023).
I wonder if it makes sense to count visitors from Greater LA, for example, considering that Greater San Diego and Greater LA literally border each other. Would make much more sense to treat them as somewhat contiguous, since the distance between some points in these two areas is basically a commute.
Nevertheless, your facts actually support what I said: whatever vibrancy in their downtown seems to stem mostly from people coming to visit it, rather than DT residents. On weekdays, especially during office hours, when you wouldn't expect a lot of visitors (mostly because the main draw of their downtown area is restaurants and bars, which tend to be much busier at night and on weekends) there's not a lot of pedestrian or cycling traffic. You'll see very busy roads, with people driving everywhere, but their public transit, active transportation infrastructure and overall urban fabric is not conducive to consistent vibrancy, unlike, for example, Vancouver.
End of the day, the whole point of my comment is to point out that the perception of safety, the general cleanliness and upkeep of infrastructure can do wonders. You are so bloody thick that the whole point of the argument flew over your head: in a city that clearly does not really care about providing an urban experience to its residents, by making downtown a desirable area to visit (both by tourists and residents of the city's suburbs) is enough to support lots of businesses.
Now, if you bring this to a city that invests heavily (if not monetarily, at least politically) in improving the urban experience for its residents, instead of just catering to visitors, and you have enormous potential. Pound per pound, Edmonton's active transportation and public transit are already superior to San Diego's, and while sometimes misguided, or poorly executed, the city has been very keen on keep the momentum going, and on nice weather days, our DT feels about just as busy.
It is also a very interesting comparison because for different reasons, both cities have their employment centres more spread out, and closer to the edges of the city, with a relatively small number of office jobs concentrated downtown. So yeah, if Edmonton can learn from the good things San Diego does, I would call that a win.