I have a mixed age, mixed gender, mixed species flock (see my Sig, below). Thus All Flock/Flock Raiser/Flock Maker with free choice Oyster shell is the only reasonable, pragmatic way to ensure everyone gets their needs met, I don't have to maintain fresh supplies of multiple feeds, and no one gets too much calcium.
Layer feed has exactly two benefits. One) Its cheap - based on meeting the absolute minimal requirements of the typical commercial layer breed, under commercial management (short productive lifespan) conditions. Two) it saves you the inconvenience of every once in a while pouring more oyster shell into a separate dish with a heavy bottom to discourage the birds from tipping it over.
On the negative side: One) its the MINIMAL daily requirements for commercial layers in a commercial management system. Do you plan to keep your birds thru molt? Layer won't help them with that. Are your birds commercial layers at all? If not, the dietary needs this food was purpose built for may not meet the needs of your birds. Two) DO you have RooS? They can't avoid the additional calcium in layer, which will build up over time in the kidneys and elsewhere, increasing risk of health problems. Even if you plan to early cull your boys for the table, before health problems are likely to arise, layer's protein content is so low it won't help them bulk up. Same with breeds which are "late to lay" like the Brahma, and breeds that only lay eggs occasionally (120-200 eggs per year), common for many of the more "attractive" breeds. DO you really think this feed was designed with Banties in mind??? Frizzles?
For me, the negatives FAR outweigh the positives. Unless the budget requires that you feed your birds as cheaply as possible (likely savings of $2-3 per 50#), or you are feeding nothing but commercial layers following commercial management practices for egg production, I'm not going to recommend layer feed.