I would genuinely appreciate an electrician explaining why the consensus is to run a new 50A circuit rather than to make use of the existing 30A circuit and an adjustable EVSE.
For many people living in a townhouse or an older home, a 100A main panel is standard. In such cases, the electrician will almost certainly want to upgrade the panel.
In contrast, using an existing 30A circuit, with a 24A limited EVSE, incurs no new wiring costs nor panel upgrades. It also allows the LEAF to charge at 87% of full L2 rate. Selling the Nissan supplied EVSE makes it a zero cost option...
I realize that cost isn't everything, but a $2000 unexpected bill (panel upgrade, wiring, labor, etc) for a new EV owner isn't fun and the pay back period isn't great either...
I see posts like this over and over again, so a sticky post by an electrician, covering the range of options, would be an excellent resource for future EV owners. It would also make it easier for MNL members to direct new members to the sticky post, like we do with LeftieBiker's excellent post.