Gears Tactics is not a cross-gen game it came out 7 MONTHS before not a few weeks before, it was not developed with the new console in mind it had stuff added on after the fact.The Forza games have never had microtransacations and 5 looks to be the same.
Those games are still Cross gen apart from Flight Sim which isn't possible on Xbox One. MS upgrading them for free doesn't change that and it doesn't matter if the game came out before Series X/S they had the upgrades in mind when making them.
As for this. People shouldn't have had to complain to the point Sony did a U turn and ask versions they sell off the game should be eligible for the upgrade.