The risk reward exists in the inverse also. If someone calls you out on you doing arm as a frame-trap after blitzer you can be punished with a HCH and lose the meter. Assuming you DHC to something safe you have now spent 2 bar to get out which a lot of characters can do and is nothing new. Assuming you don't have a safe DHC you sacrifice the character you DHC to. Its just like any normal frame-trap except it spends meter and is unsafe I don't really see the problem?
HERE WE GO
Risk/Reward literally means a situation that is risky that may lead to a reward if successful. Literally in the name.
Yes, if you go for a read that has amazing reward, and fails, you should be punished. That is common FG sense. If you spend the meter to be safe, you are safe. That is great, and sometimes this "safe" may even be plus, allowing you to be the aggressor. Meter build in this game is high anyways, so spending 2 meter on a mixup that if it works deals tons of damage, and if it fails may be made safe with meter. This happens very often.
This same reason is why people found retail Beast of Gehenna to be so amazing and prompted Mike to make changes to it. For a meter she can make many resets and approaches safe to punish for 1 meter. This utility was too amazing for 1 meter in most people's opinions. Spending 2 meter is a higher cost for such a thing, which limits how often it may be used. This does not, however, lessen the benefit that super-safe dhc grants.
Whether or not the concept of super-safe dhc is new is not relevant here so ??????
Yes if you attempt to disrespect their mixup option with a super, without a safe dhc, you took a risk. If it works, you benefit; if it fails, you get punished. If you dhc into an unsafe super (which is all up to you doing it, you can choose to take punishment), that is all on you, the player who chose to do that.
In the example of grendel arm super, if used as a frame-trap after a minus blitzer, gives this situation: If they block it, he gets punished; it it hits their throw/low/other button, they take 3750 damage. If they are midscreen, he gets a follow-up; if he is near the corner facing it, he gets no follow-up; if he is near the corner but facing toward midscreen, he can super again.
Now lets add PW to Beowulf's team, for the sake of the safe dhc argument.
This is the new situation:
If they block (and you dhc fast enough), then you enter with painwheel being at advantage. If it hits CH, then she gets a follow-up starting at 3750 damage and 1 hit of scaling.
If the risk/reward here isn't relevant, especially as a frame-trap mixup after a minus, yet unpunishable move, then I don't think we are playing fighting games right now.
There was no problem, just that you are not realizing that being minus yet unpunishable is not a bad spot to be in after a FAILED mixup.
Edit: If you did wolf blitzer, while knowing that they may block it at a low enough height to land cancel it (which unless the move they land cancel with is invincible, may get hit by the other hits of wulf blitzer), then that is again on you, the player, for doing it.