Ever tried throwing a handkerchief at someone? It doesn't hurt. Throw it really hard. It still doesn't hurt.
Except that it is magically altered to hurt. If you had a huge handkerchief that weighed a pound and used the catapult spell to shoot it at someone it would do damage.
A handkerchief that weighs a pound is a bit unrealistic, but to take this analogy further; what if you catapulted a feather pillow or blanket off of a bed in the room? Those are both soft and weigh a pound or more.
If you apply this logic to the spell you are really altering the spell itself and putting further stipulations on what can be catapulted aside from just being an object between 1 and 5 pounds.
The point though, isn't to spam Shield. But it will occasionally save your life. Whereas Absorb Elements (in my experience) is worthless. If someone fireballs you, you have Counterspell.
I am not always close enough to use counterspell. Actually, I got fireballed 3 times when I used AE last week. I only got hit with an attack once on those battles. In fairness we started the fight and I started far away with our Ranger and one of our fighters as we were not expecting them to be casters at all. If I knew they were casters I might have been closer and used counterspell.
I don't remember if shield would have worked, but I would not have used it as I was out of 1st level slots by that time (I had already used AEx3 and twinned PGE). I really try to avoid being attacked and if I stay out of melee range I can impose disadvantage on ranged attackers at will just by dropping prone. Usually if I do that they attack someone else. In the fight I talked about they targeted me specifically with fireballs repeatedly (the first time they got 3 of us but then we spread out). After I got fireballed 3 times I was near dead even having used AE (2 failed saves, 1 success). I should have dropped PEG and cast silence on them after the first fireball but I did not want to do that at the time because our Artificer was in melee and that would kill shield, in hindsight I should have done it.
Historically Absorb Elements is a spell I like to have on any build if I can get it easily, shield on any build that is going to have a free hand and not be purposely staying back like this character. I usually run a 10 or 12 constitution and that is part of this, because a lot of the stuff that will trigger AE will also down you in one shot as they are higher damage than attacks are.
My familiar got wasted in that fight too. She was invisible at the time and carrying a healing potion, intending to administer it to our downed Paladin but she got caught in a breath weapon from a hell hound.
If it's not something you tend to do then maybe its something different to try. I find players tend to look to sorcerers for room clearance, and shatter has a conveniently shaped AoE for that. But it's also on the bard, druid and artificer spell lists, so another party member may have it.
Personally, I like to blow stuff up, even if there are better ways to use magic!
I get it. It is totally play style. I like to limit enemy options, so as far as leveled spells go things that cause frightened are most of what I use for offense. Other than that I am usually blasting.
I am the only "real" caster in the party. It is a large party of mostly martials. We have an Artificer but he is more of a melee tank type build and he is going with protection spells mostly. The other characters are two XBE Fighter multiclass builds, a Paladin and a Gloomstalker Ranger archer.