Stalling for call in has been a viable strategy until it was completely removed around a year ago.
As already explained that does not mean that tone will go for their final tier without building any vehicle at all. One will simply the way that allow him to get the there the fastest.
As I already said, call in strats bring their own problems. Their removal brought more good than harm which seems to be the general concencus in this community since I can't remember a huge discussion seriously doubting this decision, quite the contrary actually.
... Even you have not provided your opinion on this question. Do you agree with Aerohank who thinks making all faction having a similar tech system in game would fine:
"I wouldn't mind if in CoH3 each faction had an Ostheer-like tech design. With Ostheer you have to make strategic choices on how you spend your resources, but you have the freedom to assign these resources wherever you see fit. "?
I have stated that the current build of the game is better than the previous ones we had, so the direction so far has been good in most cases.
Ostheer's teching system is complicated but probably the best one to time units and allow for strategic choices. It is a nightmare to balance though, plus the current design of some CoH2 factions does not allow for an Ostheer like teching (you can't strip away any more units if the faction was already designed with holes in the rooster by default), so this discussion for CoH2 is quite useless. For CoH3 it is an interesting one.
It does not. What it does it making rushing for final tier more viable since one can gain the bonus of the final tier like: MR, all out war, Anvil/Hammer bonuses, Major bonuses with sacrificing less.
Which one is it then? Because previously you said this:
That imo creates a number of problems. One of the biggest is greatly decreases build diversity since player are "given an incentive to rush towards their final tier" creating a singe optimum tech choice.
It becomes more of "braindead" decision instead of calculated the pro and cons of the options.
The main alternative to up teching were call ins. Those got removed because They allowed a player to save a shit ton of fuel by not teching at all and investing everything into the call in tanks. Players that teched instead could be absolutely devastated. In general, there is nothing bad about this system, but it does not work in CoH2: Because you cannot know if your opponent techs or not since the base sector is not accessible (I think Elchino already made that point). There is barely any counterplay to call in strats until it is already too late, therefore they got removed. The units were made viable in a different way though: As real alternatives to stock units.
Yes, "strategy" in terms of "do I tech up or not" was removed. What was not removed is your choice of units, which contributes to the strategical/tactical decision making. Instead, the changes even increased the diversity.
There many alternatives:
Keep MR in T3 now that it buffed so the player has choice when and if to unlock it.
Keep AT grenades and Molotvs separate so a player can choose when or if he want to unlock them
Make certain unit call in (not mainline tanks) so player have the option to use them instead of
having to use their final tier.
Make end tier unit more specialized that they do not make lower tier unit complete obsolete.
In the end of the day make a decision and stick with it, instead of adding bandaid on bandaid:
Either make all factions with completely linear tech like Ostheer and designed them accordingly
Accept that some faction will have holes in their roaster and make sure they are viable even with those holes...
Most of these alternatives won't do anything towars the point you critisize
No player will skip T4 because of MR (or AT nades/molotovs, you can see them in the current build already that you are critisizing).
Are you talking about doctrinal call in vehicles? Or making stock units default call ins? Because if it is the first then no player will skip the final tier.
And as I said above: If a faction is designed with holes already, then it is hard to strip more units. These factions need a full tech tree OR OP units to make up for these holes and the predictability of their game style.
You can throw a lot of alternative ideas out, but if you are convinced by them you must provide some reasoning why they could be better than the current implementation.