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Unless I have Great Weapon Master (which I don’t have and don’t plans to take), the heavy property isn’t useful on most weapons that don’t already have it, since being heavy isn’t going to increase the damage die. A heavy scimitar is still 1d6 regardless which of it’s properties I replace, which itself is the double-edge sword. Alter Armament [i]only[/i] adds a property if the weapon doesn’t have one, such as the flail, warpick, or mace. Everything else needs a property swapped.

But yes, the strength of this spell is it’s versatility over its raw damage output. Truthfully, it’s main purpose for me is to apply the finesse property to range weapons, as Finesse gives you the option to use strength or dex. In the case of range weapons, it provides the ability to use my strength for something like say, the longbow, instead of dexterity, an range property that only exist with the dinky dart. Even so, this versatility is situational.

How would giving my glaive the thrown property be better than say, taking out my hand axe and throwing it? If I miss I’m now deprived of my main weapon and have to rely on weaker back up ones. At best it will allow new tactics and weapon arrangements for an hour, and only for classes capable of utilizing it. Yes, a sneak attack with a greatsword does seem like a lot of damage, if the rogue in question invested in levels, feats, or abilities to be proficient with the great sword. In which case why throw them a bone and give them a once-in-awhile opportunity to make use of it?

 Finally not to mention, as an Eldritch knight I don’t have access to 2nd level spells right now and I only have two spell slots to work with. While I’ve intentionally chosen spells that I won’t actively need in battle, that still means I can’t just go into every combat casting Alter Armament without dwindling my already sparse supply of spells. I gotta make sure my spells have the most bang for their bucks like warlock’s, but unlike warlock’s I have low spell level progression and I don’t recover any on a shortrest.