As was said above, the same thing that works for one, may not work for another. I grow my phrags on my bathroom windowsills with a E/SE exposure. They could use more light, but right now, the best I can do. Could not grow besseae for the life of me a couple of years ago. I had them in my grow room, good light with a high in summer of 84 degrees. They would grow wonderfully until the temps started rising in the late spring, then literally wither and die! I suspected temp might be an issue, but thought I also might be overwatering. Moved them upstairs to room temp high of about 78 and they loved it, until I underwatered! Killed more!! So I asked David (monocotman) who was growing on windowsills, no extra light at the time and had lovely phrags, what he did. He had his besseae in about a 1/2 " of water and when the water dried up, he watered again and repeated.
I read that they need air and water as they grow on limestone cliffs with streams/water flowing down. So I put a hole in the pot with a soldering iron about 3/4" up from the bottom on all sides. I water thoroughly with 1/4 teas/gal MSU R/O solution, let drain somewhat then put R/O water in the
individual saucers (not a community saucer or tray which could spread viruses/disease) about 1/2". When that dries (about every 2-3 days) I repeat. Only pure besseae is treated that way currently, all hybrids are watered (same solution) and drained about every 4-6 days depending on size of pot. They are growing well and blooming.
Having said all of this, of course there are the experts and their books are excellent--Guido Bream on The Genus Phragmipedium, for instance. Although a true treatise, it was way over my head at my stage of experience. The most knowledgeable Phrag person I know personally on all species and their habitats, having studied them extensively in their natural habitats, is Frank Cervera. He has been published in many orchid journals, however, his presentation on all Phrag Species (Phragmipediums: What can Mother Nature Teach Us?) grouped by their in-situ conditions into 4 groups is the most concise, extensive info in one place I've seen that I could digest. It is in two parts. The first part is in the Spring, 2022 edition of the Slipper Orchid Journal and the second part in the Summer, 2022 edition. Excellent presentation! He presented this at the Paph Forum in DC that year with in-situ slides (which is broadcast virtually for those not near enough to attend). He said during the presentation, not to sit them in water. Not necessary. So, it's the conundrum of growing orchids. Your conditions will be unique (which he also says in the presentation). You'll find your stride. You may be able to find these articles online, but I would think definitely at
www.slipperorchid.org