I'm a returning player after 10+ years out of the game and I've always used chip stacks when playing
online poker.
I tried changing to BBs and once it got to a stage where the blinds really started to matter and my stack would seem to take a hit with every level increase.
First few times I noticed my stack had dropped by 6bbs and I hadn't even played a hand. I was back and forth in my hand history and couldn't see where my chios had gone.
Not going to lie but it took me a good 15 to 20 minutes to finally realise I wasn't loosing my chips to opponents, my stack was just changing to reflect how many BBs I had due to the level change.
I've reverted back to chip stacks and have now found myself occasionally clicking to change to BBs for a quick glance at my stack and the tables before changing it back to stacks.