It's been a rock solid operating system and perfectly usable within its limits. The moment when you feel secure with your Windows XP and it does what you want it to do, but one day something bad happens, it locks up and you had your data on it and as a result, you breakdown so hard most likely to never see your old data again, I still remember the number of blank CDs I used to burn to save my data or backup and disk defragment would take up to days. Meanwhile,Windows 10 gets shoved into your face when you refuse to upgrade, you just wish you could touch Windows XP again.
Windows 7 is the best platform for me as I am a hardcore gamer and also for work it’s okay. But I think Windows XP can be Immortal with some tweaks.