A5. I was trying to think of examples as I wrote this, but it was hard.
I used to be against kickstands (added weight, rattleyness) but then now I'm for them, because I don't want to lay my bike down with all of its heavy stuff always.
I don't remember if I was opposed to bike shorts/jerseys but I think I wasn't into it until I tried doing longer rides and realized the benefit. I still don't wear them often, but I do sometimes.
I used to wear a backpack when carrying stuff by bike, but now I don't because my back would get tired or extra sweaty.
I used to think skinny tires would be faster, but now I prioritize comfort and stability more.
I used to MTB and not want to ride on roads. Now I mostly ride on roads.
This is fun, maybe I'll think of more later!