For a new product, not supporting VR to ensure better review statistics, avoid newbie VR nausea, etc, might be a sane business decision (much as I hate that). But this is a very different situation.
Elite Dangerous is an already controversial product in decline, which will lose to loss of interest and competing products (possibly SC) eventually. Elite Dangerous also gave a reasonable expectation of a decent VR space sim from the start. To back out of VR now, completely, won't help anything, only result in a loss of something like 10%-20% (a reasonable guess) of the customer base. Many of whom have multiple paid accounts, paint jobs, etc. Many more were reasonably expecting FDev could not possibly have done as badly as they already have.
At this point, Elite Dangerous is maybe the single most notable vaporware example in the entire gaming industry. FDev is going beyond any reasonable doubt of that with this.
As for the balance point, being able to toss grenades around, two things are basically true of such scenarios. First, they are only relevant in close quarters. Second, in such close quarters, both VR and non-VR users use wall bounce to keep the element of surprise. To balance this with some kind of 'plasma launcher' could be done very simply in two ways - add wall bounce or make the player's avatar follow the plasma launcher position. Both have been done in VR and otherwise.
Bottom line, again, is not whether FDev is doing something that might be rational in another situation, but that they are acting irrationally in the current situation. FDev is clearly bringing the practices of disinterested management, customer neglect, and vaporware, to new lows, even for the gaming industry.