Hawaii here too - Hi Carol. Practically a necessity here. Amazon went from one aircraft a week to a daily 747/767/other big plane. UPS is the same.
Don’t feel bad. How you order doesn’t affect how they choose to box your items. I get boxes that contain multiple order all the time. It’s pretty clear they put whatever is on hand and going to the same address in a box and send it off, regardless of whether the order came in all together or in three separate check outs.
Ditto - yesterday morning I placed 4 individual orders for same-day delivery, and I received all 4 items in 1 envelope by 3pm.
I “subscribe” to cat food and litter from Amazon, and I’ve also noticed that if I order some other random item a week before the scheduled delivery date (that is, beyond the window to cancel the automatic shipment), they’ll just send me the auto-ship items early, packaged with the other thing I ordered.
If you are creating a new account each time, then that is abuse.
If they are offering it to you, knowing that you have cancelled it in the past, then I see nothing wrong with that.
As to the OP, I regularly order stuff that I need for work. I used to have to go to the store to pick up stuff, and now I just click a couple of buttons and have it show up.
I feel a little weird getting computer paper or cotton balls delivered, but they offer it, so there you go.