1. You build Units to make your Castle stronger and we came to the conclusion that it is not fair that you keep losing troops if you have not enough Food to support them.
Now you can use all opportunities for hiring all the Units you need.
2. It doesn't mean that you don't need Food any more. You still need Food to be able to build troops, upgrade buildings and Lost Arts.
3. Your troops still consume Food so do not forget to improve all necessary Resource buildings. What about +25% boosts to your production? You still need them for the normal vital functions of your army as you won't be able to train new troops if your Food storages are empty.
4. Will it be possible to build infinite number of Units as they don't die? Theoretically it is possible, no one knows it for sure.
5. Generally speaking, in the past you had to move your troops to your Catacombs or sent as Reinforcements to other Castles so that they won't be dissolved, now you can stand firm in your own Castle and defend it.
Nobody cancelled the fact that your troops still can be destroyed in your Castle so do not forget to move your offensive troops to Catacombs.
Have you seen questions from inexperienced players who think that their troops just disappeared after they were built? Just because their troops died due the lack of Food. And now all Lords and Ladies will be able to spend their resources to build the army. Yes, you don't need strategy for keeping them alive from deserting anymore. But now you can explore other strategies that are related to other game features while your troops are safe.
7. Units for Resources. Remember that this update gives pros to players who build units for resources. And what about all Lords and Ladies in the game who don't need to worry that their troops will die and can use them anytime? All the moments when you can catch the enemy's off at the Castle during the PvP?
There are so many ways where you can find positive changes and new strategies in order to concentrate on bigger aim than saving your troops from deserting!