One of the cool things about sparkies is that you can mix them in early and utilize them as the t2 suite for your ACU while you continue to abuse gun or gun+nano. Problem is you can't do that entirely because you still cant make radar or facs with them which a t2 suite ACU always does.
Dudes talking about sparky losing its uniqueness have no idea what they're talking about, a fast but sturdy t2 engie opens up potential game states that other factions can't reach without breaking the balance of the game since to truly abuse sparkies you are going to need 1 or 2 less t2 support factories so you can actually have the mass to utilize these 2-3 sparkies to their full potential. It of course means less units but it could enable quick but efficient titan transitions while you utilize sparkies, acu, and some low level t2 spam to stagnate the game until that phase.
Even just mixing them in with your t2 spam and having unit mixes where you have t2 engies with your forces is still interesting and different than the current t2 phase of blaze + asylum or pillar + parashield + lobo or ilshie + zthuee