So, I understand why the cost to strife was increased. The logic was: You should be able to have a choice between force pulse and strife as a magicka nightblade, one gives you more survival and the other gives you more damage, so making them have equal cost was supposed to open up build diversity, BUT...
Lets put that into the context of the game in its current situation.
Lets start with PVE: As a DPS magicka nightblade now your only go-to choice will be force pulse, previously strife was a valid choice since sustaining it was easier but soon it won't be viable at all, it deals less damage and most teams prefer to have their DPS doing as much damage as they can and have healers take care of healing, also the healing from strife won't help you survive most mechanics. HEALER nightblades can still pick funnel health but then again we can all agree there are better stuff for them to fill up their bars with. I can't imagine TANKs using strife as spammable either.
Now to PVP: Magicka nightblade can be played either with light armor or heavy. Light armor is more bursty and quick while heavy is a brawler. Comparing strife with force pulse for a light armor magicka nightblade, I think force pulse will again be the go-to choice, it can apply status effects and does more damage whereas strife will make you end up feeling like you lack damage but gain nothing in return as the healing bit of strife in light armor is not enough.
In heavy strife used to shine because its healing part was significant but sustaining in heavy is not easy, the cost increase goes directly against this type of build as well making it even harder to sustain.
These are all my opinions and can be wrong, but I think with the way things are, this change does not open build diversity as I can't see a single situation where we can say strife is the go-to choice. If it is already decided that strife should have its cost increased no matter what, then what I propose is:
*cost increased but still being less than alternative spammables
*cost increased but healing also increased to make it a more favorable choice for light armor setups
*give something to strife to make it shine in a way that will make it useful, I can't think of any buff but I'm sure devs are more creative than me in this regard.