I dont fully understand the virtue of Gap insurance but it may make sense for some finance deals. Especially back when it was not unusual for a 3 year old car to only be worth 40% of its price new . (leaving aside big discounts sometimes given on purchase price, but also any extra paid in interest on a finance package)
In round figures I paid £22K in for my new Mk4EX in 2021.(No finance) After 3 years I got £16K in part exchange against a new Jazz (Ie it retained 72% of what I paid for it) Due to inflation (and maybe exchange rates and extra profit for Honda) a new Jazz advance now cost about £28K (

) But even so my 2021 jazz contributed 57% of the cost to change. (I know I could maybe have got some discount on the £28K list price , but wouldnt then have got £16K trade in )
Does GAP insurance still make sense with such high retained value?
Do you have Gap insurance outside the UK? -I know in some countries you can get basic third party insurance then extend this to fully comprehensive with a separate insurance policy called Casco Insurance. The Casco could be with a different insurance company to the 3rd party.
To clarify, Gap insurance offers protection if for instance a car is extensively damaged and no longer worth what you still owe on a finance contract.