I have a Hellcat Kydex Holster attached inside my console. I do occasionally make use of it and find it user friendly. The gun can be unattended for brief periods of time which I know is not the best judgement. I will also use this setup on longish trips. I like the ability to ride for long periods without wearing a gun but drop the gun in my holster (on body) to exit the vehicle. I do find this easier than trying to draw with a seatbelt. I don't see my self wearing a shoulder holster or a tanker style holster either although I do enjoy my tanker holsters outdoors.
On the scant occasions I have to leave my weapon in my vehicle while out and about, I use a well-made lock box. Otherwise, the pistol doesn't leave my person.
This is not a current picture of what I carry now. This is my Hellcat RDP, which is no longer my EDC. My EDC currently is my S&W J-Frame. I don't have a picture of the current seat set up, but it is the same. Once I get in the car or truck (I have it set up in both vehicles), my pistol comes out of my pocket, pocket holster and pistol, and I transfer the pistol to the seat holster. Once I get to my destination, I transfer the pistol back to the pocket holster and put it in my front pocket. All within the confines of my vehicle, unseen by anyone outside the vehicle. I also have holster shells to fit my HK VP9 SK for the few times I might change out my EDC to that pistol. Aside from MAYBE a shoulder holster, there is no way to have faster access to my pistol while in my vehicle. No one is going to change my mind about my set up. And I don't leave the pistol in the vehicle unattended.