Most quality bike brakes have kevlar hose as standard and have done for ages, braided steel performs the same, it’s just heavier and bulkier. So usually it’s a downgrade, but people think it looks nice and some influencial companies have dubiously sold it as an upgrade (looking at you here Hope) so that sticks.
Even on cars and motorbikes, rubber hoses perform fine- but the lifespans are longer, my motorbike had a 10 year replacement cycle for the rubber hoses and how many pushbike hoses get to 10 years (and then get replaced with braided?)
Replace tired parts with new, and a good bleed with new fluid, and sure you’ll see an improvement. You’ll tend to replace pads at the same time and so you’ll see an even bigger improvement. Best of luck idenftifying where the improvement actually came from though!