You should be able to convert the camera raw to DNG directly without generating tiff files. DNG is a raw format (open source). The Adobe DNG converter is free, and while it is one extra step it is an easy workflow. Download your Camera Raw files to computer, open the Adobe DNG converter, convert files to DNG, save. If space is limited no need to save the original Camera raw files. Now you will be able to open the DNG files in earlier version of PS and process as before. Costs nothing and does not double your file storage. If you wish to keep your original camera raw files you can embed them in your DNG files for later extraction.
Truthfully, you should spend some time with Lightroom before dismissing it. The raw conversion is far superior to early versions on PS, and all the workflow is non- destructive, as it is Parametric Image Editor.
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