Sylvia? Did you mean me? Yeah, it might seem dramatic, but where I live, we can have frost as early as late August (rare, but it does happen) so I figured, at the current growth rate, I'd better concentrate on the tomatoes I already have, most of which are somewhere between pea and marble size right now! It does me no good to have green ping-pong ball sized tomatoes on the vine in September, which is where my plant was heading.
Don't worry, this plant is quite definitely 'vigorous' and 'productive' and I expect to have more blossoms in a few weeks, to replace the ones that I pinched off!
It's taking longer than I expected for my tomatoes to ripen. A lot longer. Anything I can do to speed up the process is a good thing.