I have a car. But using it without intelligent thought beforehand is a bad habit.
Rail travel and public transport is far more reliable than road. Road has very little certainty on journey time or reliability compared to rail.
Of course one must be intelligent about car use. However, to some people, intelligent use means putting the car to use at any time that it more economical than travelling by public transport, which will inevitably mean most journeys (unless you a commuter to a big city) if you consider the fixed ownership costs as a sunk cost to have the lifestyle that not relying on public transport gets you. Others (myself included) are prepared to pay the extra to use public transport for some journeys that could have been made by car, in my case to avoid the hassle of driving, and/or because I am an enthusiast, and/or because I wish to avoid the expense of owning a second car when my wife wants to use it at the same time as me!
I am not sure at your reliablity assertation [maybe some kind of countrywide average?].....
I live in a town with reasonably free moving traffic, with congestion only at weekday school times (and that quite predictable). Journey times by road are reliable, and any incident affects cars and road public transport alike. However, most of my car journeys are in the evening (when there is no public transport) or at weekends, and they are very reliable.
My regular longer distance journey (of about 40 miles) involves a reliable car journey of 70-75 minutes. The public transport option (broadly following the line of the direct road) involves a 30 min walk to the station, a train ride (3ph) of 20 minutes, a 10 minute walk from Station to Bus stand, 20-30 minutes of waiting and a bus journey (hourly frequency) of 60 minutes, with a 5 minute walk at the end. Total 145-160 minutes. By car the return trip takes the morning, or the afternoon or the evening, any day, any possible departure time from either end. By public transport the return trip takes the best part of a day, cannot be made in the evening, and on Sundays is severely limited as to the time it can be made. I have made the journey many times by my car and by public transport. My car has never been delayed by shortage of crew, incident on the line, earlier incident on the line, signal failure, overhead line fault, broken down train etc etc. The one significant delay to a return car journey, in the late evening was caused by a road closure due to repairs to a railway bridge!
The bus part of the journey has rarely had any delay, but the anticipation as I arrive at the Station, particularly on the return journey......