Actually, there were substantial improvements in September of 2018, eliminating all of the showstopper issues for playing back finished recordings. As I said in my post, I suspect the fixes were in a Google rather than Tablo update. In any case, it might be time for Tablo and Friends to consider encouraging rather than discouraging Chromecast customers.
Even for playing back shows being recorded, to skip a commercial, you stop Chromecast, position past the commercial, then restart Chromecast; and it continues from your position past the commercial. This isn’t right, but the workaround is quick; nowhere near as onerous as recovering after a Tablo app abort, which used to be frequent in many situations before the September changes.