It currently takes several weeks to spin up a Stellar validator. Last time I checked, you needed several days to a week to do the same for Ethereum. This has probably not improved. Both are growing rapidly and it's becoming a problem for adoption.

Both have on disk data well over a TB. And it's early days. This stuff is getting progressively less feasible to run for normal users as more users start using this and start adding their own transactions. Long term, sharding is not going to be optional.