I think it is, I use a client (RelayTools-android) that only connects to one relay at a time for it's feed, so I can use less data, check my notifications, and have a quicker app. Then it connects to other relays only when I'm posting, to send the post. If apps support this type of mode, it can be helpful yes. I think amethyst might partially support it. It's like having a fast cache of the notes from your network, always collecting them in the background for when you want to read them.