Why didn't you just get the X last year instead of the 8 Plus, since all the benefits you've said that justifies the cost were on the X too?.....
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TBH I'm feeling a bit the same. I currently have a 128Gb 6s Plus, that still works well with no problems, and i have over 30Gb of space left so am not desperate for more memory. Last year i pre-ordered the X as it had been 2 years on same phone, but after a few days i ended up canceling the order. I just couldn't justify the huge increase in price, and in the 10 months since i canceled have i regretted it at all? No, my current 6s Plus has been fine (i did replace the battery though), and i'm probably £400-£500 better off (price bought at minus price could see at minus costs)
Now that i've pre-ordered the XS 256Gb that has way more memory than i'm ever going to need ( I don't watch movies or TV shows on my phone, short Youtube videos occasionally if someone sends a link on WhatsApp etc), and it's the same cost as last years X would have been that i ordered, i am still feeling guilty at splashing out on something that my 3 year old phone can do for me instead. Buyers remorse i suppose.
I'm just gonna wait until next friday when it arrives and see if it changes my mind.