Fair points for sure, though I'd argue that Conway's limited minutes and only 9 FTA on the season is far too low of a sample size to make any conclusions on that especially with his garbage time role.
Looking through Pitino's history, FT Rate is maybe the most inconsistent metric for his teams over the years. In just the last 3 years alone he's had one top 30 season and one sub 300 season (last season's 324th ranking tied for his worst with his 2011 Louisville team). I may end up being wrong and you may end up being right, but if Watkins is added I can't imagine another season where we struggle getting to the line.