We understand and agree with your reasoning. Got a 990 and 993. Our first 990 set had to be returned as it wouldn't power up so we could not operate Lionel then, no base. The second 990 would not charge or power down and was returned. Again we could not operate Lionel, no base. The third 990 set won't charge and the 993 has display issues. As unreliable as these are if we had to do it again we would've gotten two 990's just so we could possibly use one them when the other is in for repairs.
If it weren't for bad luck, you'd have no luck at all!