Profile of nee

Demo locked behind the minesweeper upgrade sounds like a good idea, it does nothing but limit the ability lay them to specific engineer units, which means the enemy will know that once spotting such an engineer they can expect demo charges, if not their mines being swept clean.

For example what I mean when I say passive abilities, conscript repair kit for example. When you reach it you do not need to invest any resources to exploit it.

There are no "passive abilities" in this game; they are basically just ability unlocks. Some unlocks (re stun grenades, weapon upgrades) happen to be abilities that cost munitions whereas some don't (re conscript repair kit, hull down).

If you really have a concrete idea of what "Passive Abilities" are I suggest you take some time to list them all and not a handful of "examples". And also explain why certain ones that might be construed as also being passive abilities does not fit your criteria. For my part, anything that's not off-map artillery or a unit being called in is a passive unlock, from OKW's Signal Relay to Ostheer's G43s to USF's Elite Vehicle Crews to Soviets' Ambush Gun Tactics.

Lend LEase is nice, but most of its call-ins replace your core units and because of that don't really fill gaps in the core roster.
The commander itself is really good, but ultimately people need heavy tanks like ISU-152 and IS-2, not a better 76mm.

IMO Relic probably had some sort of bad experience in the past due to disclosure issues and they just don't want to take any risk whatsoever.
I mean if you were robbed by a black guy dressed like a gangster, it doesn't matter what other people say or write about how dumb or paranoid you are, end of the day you look at that black guy looking like a gangster with hands in his pockets walking towards you differently, because you learned the hard way what might happen because it actually happened.

I'm not saying Relic shouldn't do more about what they can do regarding sharing information at a more public level, because I think they're better off if they did (depends a lot on the info and subject matter, of course). I just think it's not surprise that they are hush hush due to experience garnered from past projects.

At least one way they can do something about this is to make more use of the beta game variant, whatever wild ideas they are considering at the informal level they could put it into that game and let everyone try it out for themselves. Alpha projects could be reserved for something more substantial like DLC or expansion campaigns, whereas betas could be slight changes to unit XYZ. I'm not sure why they abandoned the beta after they did exactly what I just suggested last year, the only problem with it was that it was a pretty big change in multiple things that tempted too many people to abandon the public version.

It's kind of like Luftwaffe Ground Forces and their Fallschirmjaegers- they're not great except for a pop from behind. Versatile but comes at a cost. Certainly not a unit that will replace Grenadiers or Panzergrenadiers, but they make great supplements if you ever need them.