When Tank Platoon being my first mod adding real entities to the game (when having only 5 types of tanks up to MK2, total of 16 vehicles), I have not even think about that.
But yes, when I started to add more entities with newer mods like Alien Tech, I have once thought of putting them in other tab. End up 3 choices at that time:
A) Merge into vanilla tabs, as integrated to vanilla game. (Current choice.)
B) A single "Schall" tab for all my mods.
C) Multiple tabs in different category. For example, one for "Schall logistics" (all those armoured locomotives, Tank Platoon tanks, Alien Tech tanks, etc.), one "Schall production" (those overtiers from Machine Scaling), one "Schall Intermediate" (those alien ore conversions recipes from Alien Tech), and one for "Schall Weapons" (all those new ammo ,turrets and equipment).
There are goods and bads for each choice. Let me name some of them:
First of all, I do not think I have enough entities/recipes to set up independent tabs.
Secondly, before I started modding, I really HATE all those mods adding tons of new tabs, while some of them having just having less than 10 recipes inside. And when having those overhaul mods (Angel's, Bob's, 5Dim, Yuoki, etc... yeah, long time ago...), EACH of them introduce 1 to 4 new tabs, cluttering the "crafting tab bar", which really annoys me. I even found some mods trying to "regroup" them into less tabs, so I am quite sure at least a proportion people share the same opinion with me. So I am least favoured towards choice C, probably never fond of it.
For choice B, it still makes all my entities look separated from vanilla game. It also gives the "wrong" impression to players that my mods are overhaul mods. (I always aim to only extend vanilla gameplay, NOT replacing vanilla mechanics. At least my mods are not trying to circumvent the vanilla ore processing like Angel/Bobs.)
There could be some (minor) concerns too. For example the vehicle batteries and shields. Should they be in the new "Schall" tab? And how about personal battery and personal shield MK3 (from Alien Tech)? Should they be alongside with their vanilla MK2 variant? Also the same for overtier production machines (from Machine Scaling).
So I will just stick to choice A, for the moment. At least before some downside of choice B is solved.
For "tiers" of tanks, do you mean the light tanks and medium tanks in their separate rows? Or separte MK1 row, MK 2 row, MK3 row, etc?
I have thought of this within choice A. But it may make extra rows in the already long "logistics" tab, so I decided to drop this idea at that time.