...I suspect that people who are accustomed to walk-on transferring at fare-paid platforms will find this annoying....- Paul
In retrospect, and my getting accustomed to using Presto on GO, you're right. In analyzing my discomfort when getting on the Cherry St bus at Cherry beach with my valid paper transfer, since the bus had no Presto machine, I was uncomfortable in having to make my case to the driver. It was like having to justify myself, even though she was compliant, although skeptical. Had there been a Presto machine, I could have just tapped on like Lucy states, and trusted the system to charge me or not.
That's a small but important point that can affect a traveller's mood for not only the experience of that one trip, but for following interactions: "Am I going to have an argument with this person in uniform?". One of the greatest advantages (and for some, a social disadvantage) is the isolated driver in the new Flexity streetcars. His/her job is now to just drive, and the patrons have no opportunity to present or be presented with negative interactions.
I may have spoken too soon. Let me rephrase my hesitance to use the TTC for shorter trips: "Until Presto is fleet wide, I hesitate from taking the TTC for the purpose of hopping on and off to interrupt my journey with segments of quality walking".
The TTC has an opportunity to sell the Presto card as being able to do that. Some US SW (and Cdn) transit companies do exactly that by selling time on their systems, and "refreshing transfers" for a nominal fee. It *attracts* riders, just like a day-pass, but tabulated in a modern electronic way.