They are no more disabled during sieges. Now you need tank with repair ship or dodger. Basically platforms make afking sieging more complicated.
And you mentioned 2 arrays type out of 3, and because type 1 useless anyway, your proposal dont different from just removing platforms. 2750 range require probably 4 platform minimum to set decent defence from battleships with siege guns.
Im dont sure, maybe limit WP from placing on core 1, or even 2 maybe?