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The Forge World Zone Mortalis rules are interesting, but one rule that we have discussed is why limit unit sizes to 10?

Is it a balance issue? yes larger units could roadblock a bit through weight of numbers, but so can't certain walkers and other tough units, etc. if the enemy can't bring anti-armour against them in the moment.

We are trying to understand the need/reasoning for taking away the main perk of certain unit builds/tactics in Zone Mortalis as it seems to only target certain armies.

For example marine units are ten or less anyways: Thus it has no effect on them, while armies like orks and nids who often rely on unit size as an equalizer get that tactic/option taken from them.

marine saves make small squads feasible, the units I mentioned don't have that going for them and lose what they normally have to compensate for it. In addition large units will be cumbersome to manouver, mor elikely to get hit by cave-ins, etc. and seem to be troublesome in some ways to the user, so I guess Im missing the issue with them.

We are thinking of dropping this restriction (though we WILL limit units to being ten or less if they want to use a blip marker: the reasonign being that larger units cant really hide their numbers/presence), but are not sure if we are opening some can of worms we are'nt considering.

Thoughts?

It really appears that (especially considering the location of the 6th ed print version of the rules) ZM was written with Marine on Chaos Marine or Marine on Marine action in mind.

The way we house ruled it, was that any unit which was natively more than 10 models always counted as moving through difficult terrain (representing the clumsy nature of moving large groups through small spaces), and never benefited from the blip marker rules.
It has worked out well so far.
The other option we considered was allowing a modified FOC for Horde style armies. Essentially allowing Nids/Orks/DE the option to take more troops, while still having 10 man squads.