No it's not dumb. It's perfectly normal and, especially in a non-remote situation and even more especially with relocation involved, pretty hard to do any other way. And it's not like you can't be laid off during a trial/probationary period with probably very little severance involved.
Sometimes stuff does happen and you can't protect 100% against every eventuality. And your current employer can lay you off too and then you are 100% certain of being unemployed. (Yes, there may be severance is that case but there is absolutely no guarantee that severance generally amounts to much.)
Sometimes stuff does happen and you can't protect 100% against every eventuality. And your current employer can lay you off too and then you are 100% certain of being unemployed. (Yes, there may be severance is that case but there is absolutely no guarantee that severance generally amounts to much.)