You’re right as usual!Not at all, it's easily transferable. There is no downside to saving for your future. Even if you get a penalty for withdrawing it, it's more money than you had before.
There isn't a good reason not to take advantage of the 401k other than laziness or you are living so paycheck to paycheck you can't save 5%
I did go through a stupidly frustrating/inefficient process last year of trying to combine multiple retirement funds from previous jobs so might be jaded. IMO, still not worth setting it up unless you’re planning to be at target for at least a couple years (or indefinitely). Or if you don’t have any other retirement savings, then start somewhere ASAP!! And target’s is actually pretty good!!