This. I recently upgraded from my ageing iPhone 6 Plus and Canon 550d to the iPhone X, (so the cost to change was more like £500 than £1,000). I hardly ever feel compelled to take the DSLR out and about with me and the camera on the iPhone X is beyond amazing. Blisteringly fast and sharp photos every single time.
The new Samsung Galaxy 9 looks impressive too, with variable aperture control. Yeah, a decent DSLR is always going to be better than a camera but cameras in phones are getting better with every iteration.
I managed to snap my iPhone X up for £960 with an Argos promotion, and the fact I've not felt compelled to upgrade my laptop in four years speaks volumes. Changing times, it seems. In some respects, £960 speaks as good value. It's not just a phone anymore.
Yeah, you pay a premium for Apple products. In other news, water is wet. But the difference isn't all that great. It's only 14% more expensive than the new Galaxy 9 Plus (and I only paid 10% more).
The S9 plus has a larger screen size. If you comparing the X to the new Samsung then it should have been against the S9 which is £739 - that's quite a saving. Not sure about your maths either as you initially had to pay for the other items. I would comment that if you rarely use your laptop anymore than you are probably one of those people that doesn't need a computer anyway. There's no way I could use a phone (iPhone/Android) as a substitute for a Mac/PC etc.
Hope you enjoy your new purchase.