I use them both all of the time. Some things are still better in Logic 1 and many other things are better in Logic 2. It’s perfectly fine to switch between them.
But, I feel you about the lack of Logic1 file loading. I mean, they have the source code for both, how difficult can it be to support your own file format? At first it was like “yeah, they’re busy making a new, awesome program, give them some slack” but now it kind of seems to stick out like a sore thumb. I’m sure there are reasons. And, we can all live with it because we can still use Logic 1 (even if you have to fudge the V1 version most of us have installed because of the expired update thing). So, while I find it quite odd I tend not to dwell on it too often. Just load Logic 1 and view your captures. But, still, I’d really like to see support for it added soon.