With all due respect, multiple sightings for confirmation is not a requirement. I leave multiple sighting confirmation up the discretion of the observer. If a person is unsure of sighting then they should repeat it if possible. That is the same practice I use/encourage with anything: asteroids, dwarf planets, supernovae, moons, galaxies, etc. If I am not satisfied with what I saw then I repeat the observation another night and hope that others will as well.
From my perspective, the problem with Pluto is not making it seem too easy, it is that for too long folks have made it seem too hard. Putting another obstacle in the way of observers, who frequently are not keen on spending much time on a faint point of light in the first place, seems counterproductive to me. Many folks describe having few opportunities to observe under dark sky conditions and some for only a single night at a time, which is a major consideration for Pluto. Suggesting that their observation won't be valid unless they can do it over multiple nights is not helpful. Better to encourage someone to make the attempt, even if it is only a single attempt, rather than telling them they must see it multiple times.
The same principle applies to other difficult objects. I didn't hunt down 17th magnitude dwarf planets Makemake or Haumea with the belief that only multiple sightings would be valid. That would have discouraged me from making the attempts since getting the conditions is not so easy. I did do confirmation early with Makemake, because the seeing and position was so marginal originally that follow up seemed necessary. Haumea was by its lonesome and in good seeing the following year, nothing else close enough to be mistaken for it. I can't remember if I got another opportunity for it that year or not, I know I observed Haumea again this year in good conditions again.
I first viewed Pluto as a novice with an 8" SCT using the same type of charts, and it wasn't that difficult. It was about 0.7 mag brighter then, but the concept is the same. No surprise then that a 10" would render it similarly to my son a few years ago. There have been times I had doubt about which point was Pluto, it depends on the field it is in at the time, as well as conditions.
If folks don't explore the envelope, then their observing skills can end up stuck in a rut. We each have different limits, but we don't know what those limits are until we try them. I will continue to encourage folks to press their perceived limits.