Pinging me again sometimes makes sense (if we have a relationship and it's important) but it doesn't scale well. As someone who gets a lot of outside requests to do things, second and third emails to ask "did you miss my email?" get tiresome in a hurry.
(Sometimes I genuinely missed something interesting but this is rare.)
As someone that lives life like this, yes, that's the point. If it's really important, they can ping me again and remind me to respond. Or when I have some downtime I'll peruse through my messages and emails again and stumble upon it and remember to reply.