HVGs in mnn_correct

In this tutorial: https://nbisweden.github.io/workshop-scRNAseq/labs/compiled/scanpy/scanpy_03_integration.html , they use HVGs that are in at least 2 batches. Then use those HVGs later on for dim reduction.

Would it be a better idea to just use the HVGs that are in at least 2 batches (also should this number change with increased batch # integration?), then once again find the HVGs with the batch corrected data, as suggested here: Highly variable genes - best practice?