How much is due to the tax credits, at least in the US? Last time I looked, a big chunk of the expected first year depreciation on my F150 Lightning could be explained by the credit. The expected depreciation in the years following tracked very similarly to ICE F150s.
The EV market is just weird, anyway. Manufacturers have to price to what the market will bear, which may have little resemblance to MSRP. So a good evaluation of deprecation has to figure out how to account for that. My Lightning had an MSRP of 72K but I got it for 51K, which was a very normal price that anyone could get. If I evaluate resale based on the MSRP, it looks pretty bad. If I use my out-the-door cost for comparison, it does not look bad at all (compared to any other new car purchase, of course, which are never going to be the most cost-effective choice for an individual).
The EV market is just weird, anyway. Manufacturers have to price to what the market will bear, which may have little resemblance to MSRP. So a good evaluation of deprecation has to figure out how to account for that. My Lightning had an MSRP of 72K but I got it for 51K, which was a very normal price that anyone could get. If I evaluate resale based on the MSRP, it looks pretty bad. If I use my out-the-door cost for comparison, it does not look bad at all (compared to any other new car purchase, of course, which are never going to be the most cost-effective choice for an individual).