We bought a Demo MG4 51 with 1,000 kms on the clock and 10 mths rego remaining. We paid $3,000 less than the new car price (until they conned the wife into ceramic tinting and paint protection .... for an additional $2,000

) and I think we will keep the car till the wheels fall off or someone crashes into it.
The depreciation is savage over the first 4 to 5 yrs, then it levels out, if you find a vehicle at a good price that you know will appreciate over time, then you can beat the depreciation trend.
Out of the 15 vehicles we own (yeah, the wife says something similar, but with adjectives that wouldn't be allowed on the forum) the MG4 is the only one that might suffer depreciation .... but only if I was to sell it, the '74 VW Kombi I bought for just under AU$2,000 in '98, would sell tomorrow for $50,000 and with maybe $30 to $40 thousand spent on a restoration, possibly up around the $100,000 mark .... but again, only if I sold ir .... and that isn't ever likely to happen
Even the silver '06 Prius, who would have thought that was an investment rather than a money pit, paid $6,500 for it, after a battery fire due to my own stupidity, the insurance paid me out $10,000 and I got the car back. A $2,000 investment in a new battery has had it on the road again for roughly 3 yrs and is now priced at $13,000 and rising by looking at ads for the same model for sale .....
Buy the car because you want it, not for what it might be worth in 3 yrs time .....
T1 Terry
And just to address the Solid State battery concern, they have been "just around the corner" for so long now, I doubt they will ever be the big thing everyone hypes them up to be.
New battery technology is moving so fast, they will be left in the dust. CATL recently announce a battery that combines Sodium ion cells and LFP cells, to gain the benefits of both chemistries, the high discharge rate of the Sodium ion and the rapid acceptance rate when charging, of the LFP. If someone finds a way to combine Sodium ion and LTO cells, you would have a battery that could deliver 1,000 mile before a 10 min recharge and deliver another 1,000 mile, yet last for 30 plus yrs, but a more sensible battery capacity would see 500miles, 5 min recharge and another 500 miles if you needed it ....... the window for solid state batteries to enter the market has all but closed .....
T1 Terry