Not quite true, they changed it a few years ago so agencies had to stop scamming both tenants and landlords out of massive fees (often charging both for the same thing) every time the contracts were renewed.
That and the tenancy deposit scheme overall has made renting a lot less stressful than it was a decade or two ago.
These are all very minor changes. Yes, agencies can’t steal 100£ from you for each renewal, but they replaced it with commissions.
The tenancy deposit scheme is again a fake solution. Landlords can still block your money for months and force you to accept some deductions (because a fork is missing or the flat hasn’t been “professionally cleaned”). If you are money constrained and don’t have enough money to pay 2.5 months of rent (first month plus deposit), you are forced to give accept your landlord’s deductions in order to move to the next flat.
That and the tenancy deposit scheme overall has made renting a lot less stressful than it was a decade or two ago.