The ammo consumables don't play a big part until some of the higher level strikes. The times that they are needed are usually the intense waves or boss battles, when bringing up your inventory is dangerous, and may not be an option.
Let us hold reload for 3-5 seconds to use one, or even replace our emotes while in battle. We need to be able to do these things on the fly.
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I have always been saying that the emotes were and are pointless. I would much rather have those four buttons for consumables! Or at least two of them (one for ammo and the other for glimmer boosting)!