I like the "old" tricorder, because, well, this IS *the* one and only tricorder (besides the TOS one *g*).
But regarding the kits, I think most kits have the tricorder function somehow fumbled into a wrist based device. I'm not sure but I think most engineer kit-abilities are applied through entries made on the holo interface originating from the wrist. This makes more sense to have on more combat-heavy operations like... wel the entire game
I didn't like the kits at first. I still don't but have accepted them as a means of advanced device supporting the away team with transport pattern enhancers to beam out of dangerous enviroments, forcefields, all kinds of medical and tech supplies, amour etc.
if I remember correctly, the game ST:Elite Force 2 (I only played the 2nd installment) had the Voy Endgame tricorder - or something like it.
If the game had more uses of the tricorder, it would be interesting then to see different versions.
I recall "StarTrek: The Fallen" having the tricorder being essential for finding an enemy's shield freq along with a full 360° sphere of objectives and objects worth searching for.
But yeah, I like the chubby one.
Yet I`m surprised why Cryptic had not put Spock's TOS tricorder for Cpoints yet ^^ (or did they?)
I played The Fallen, and I remember how to scale their interiors are and the camera didn't have much trouble, but anyway different topic...
They should make a retro visual look at the tailor, if you enable the retro feature, everything you wear will turn to the retro look, you kit will look retro (no holographic interface), your armor will look like what they were in the TOS movie eras, but since they already have retro weapons, they can't make the weapons retro.
In universe answer? The Mk 8 Tricorder was robust, easy to use, and "cheap" to make. During a war, you're going to have lots of Tricorders in use, lots of them breaking, and lots of them needing replacing. Thus, you use a robust tricorder to minimize the times it is able to get broken, and also it's "cheap" to make, so easy to replace when needed.
Out of universe? It's a very visible model, very iconic and easy to see. A flatscreen PDA thing? Not so much.
Besides, it's obviously had /some/ upgrades, it has holo-emitters embedded into it with added UI space, and indeed "navigation cones". So up to you, but that explains it for me.