Why Do People stop Their Cycle COLD TURKEY? Why not just Wein Off it? To avoid crash?

Why not simply take like example :

500mg Test E Weekly for 10 Weeks.

And after Week 10, Wein Off it by simply gradually decreasing the dosing each week.

Like 300mg Week 11, 200mg Week 10 , 100mg Week 9 All the while taking HCG and PCT therapy While you Wein off. This to prevent any Crash at all and losing gains.

Why not come off it slowly? than Suddenly stopping completely? PCT is not strong enough to restore test levels in 4 weeks. So why not decrease Test slowly.