I find it really interesting how Marksmen with Hochland Long Rifles inside squads of Handgunners can benefit from the accuracy buffs that are abundantly available, making them almost a must-take. Run the formation and have a nearby Captain, and next thing you know all your HLRs are hitting on 2s, wounding on 2s, and picking off enough of your opponent's stuff to force him to come to you (and hence into range of your Handguns). It's almost viable to take only Handgunners/Outriders, backed up with the appropriate buff characters/machines, and Cannons. I say almost viable, because you would still need a few close combat units to muscle through once that part of the battle begins.
The funny thing about Age of Sigmar is that the Sigmarines are disinteresting compared to the previous Fantasy factions because of how undeveloped they are. Simply speaking, looking past the shiny gold and fancy details Stormcast Eternals are actually a very basic army lacking the flourishes that are supposed to make them neat to play on the tabletop (such as Monsters, Artillery, Wizards, etc). Given GW's refusal to release the rules for models that aren't purchasable yet/haven't been done, we as Fantasy players have no idea what the meta-strategy and play intent of the SE faction is.
Are there going to be Sigmar Tanks? Azur Dragonriders? Celestial Cannons? Sigmarine Wizards? My point is, how can they expect us to buy miniatures for an army that isn't complete? Sure, it will be at some point, but until the game stabilizes and becomes more fleshed out, I'll be keeping my money inside my wallet.