Yes and its way worse because it just becomes even more deathballish. Ask your self this, can you justify a Colossus that moves at 1.5 as a unit that is extremely strong positional? Otherwise it will just be a slow moving deathball unit.
The units that are great in deathballs are all medium-or-faster speed units, not slow units. Like hydra/roach balls. Throwing in Broodlords makes it way less deathbally and more strategic. People don't talk about "Mech balls" because they don't exist. They don't work that way.
Just nerfing the Colossus speed somewhat and buffing its core stats (somewhat) is a receipt for a disaster. If you have a very detailed plan on how you want to make the unit positional, that's great. But trust me, you have to go much further down than 1.5, and the safest solution is to let it be completely immobile once it enters its "High cost efficiency"-state.
But given the current design of the Colossus, it's essential to understand that the main reason for it being so amovish and deathballish is due to its lack of movement speed (not vice versa).
The phrase "trust me" is a little bizarre when we're having an argument.
The fact is that A-move sucks with slow units. A-moving is only effective with units because they have reasonable speed. There are some very powerful slow units in SC2 and if you notice, they totally suck in deathballs. They get crushed. A deathball that is slower becomes a lot scarier to use because it's much more vulnerable to counterattacks, surrounds, and getting caught out of position.
Wanna know why terran bio can move out on the map easily and protoss cannot with their robo units? Because bio units can escape and defend multiple locations at once due to their mobility. Colossus can't escape on the other hand. In fact, the protoss player has the most "commited" army out of any races.
If the Colossus was strong enough positionally so you could split them out all over the map --> That's one possible solution, but it requires huge design changes in multiple ways from its current state.
??? the comparison of Terran's most mobile composition to Protoss's least mobile composition is pointless. The proper comparison would be Protoss deathball compared to Terran mech. And we both know that Protoss deathball is way way way more mobile and way way less committed than Terran mech, so this is just silly.
Colossus is too mobile. It moves around the map too easily. This makes it a much less risky unit to use, and that's what makes it boring and a-movey. If it has more risk to it, more clunky to use, then it would be engaging and funner to play with and play against.