I'm pleased your doing well Andrina.
I can understand why your Stoma Nurse said less is more, as not to overwhelm you, but once you're out of hospital, you need to use as many products as necassary to make life with a stoma, whether temporary or not, as easy as possible.
In regard to ConvaTec being a Dinosaur, she's so wrong and the Hospital probably has a supply contract with Hollister.
I was told the very same and I also left the Hospital with Hollister supplies; the Hospital even had them delivered to my home.
I persevered using Hollister products but they didn't work, I had nothing but trouble; developing excruciating skin errosion around my stoma due to leakage; it was a huge relief to return to using the ConvaTec products.
I also used the two piece appliance by ConvaTec, which offer a mouldable self adhesive wafer, so there's no faffing around cutting wafers to size, ( I don't believe Hollister provide mouldable wafers).
I would wear the wafer for 3 to 4 days, as it start to look grubby by then, also the adhesive edges begin to peel away from the skin a little, but it never leaked.
Before my J pouch creation and the Temp Loop ileostomy, I had a stoma for years and my output was too thick to use the elephants trunk drainable bags successfully, so I used a Non vented ConvaTec closed bag, which I would just remove from the wafer, empty contents down the toilet and through it away, then replace with a new bag; for me, this was preferably than the drainable bags and I reverted to this with my Temp Ileostomy too, until takedown.