double ini, not necessarily double scan is good at taking map control and space through utility. Double ini will use recons flashes and stuns to take space and set up a single duelists, however because so much of this value comes from investing utility before taking fights, its map control patterns are very very predictable and counterable. Once ini util is commited to one side of the map, defenders can simply gain information about where space is being taken and which lanes are recieveing util, the weak lanes and where the single duelist will be positioned.
So, when defending against double ini u should do lots of contact plays as the timings of when to contact are pretty obvious, and you should know if ur contacting a weak lane or a strong lane as the inis will need to set up the single duelist, so u can easily contact and exploit their weak lanes. U should also bait out as much early utility as possible as double ini relies heavily on utility to create strong site hits. If they are forced to spend utility early, their execute becomes very weak, whereas if u dont contest the early lanes then they will have a very very strong site exec. Also if ur the team playing double ini, u shouldnt rely on contact plays as the enemies will contest early space so u will just be dry walking into them and because double ini is built around using utility to take map control, so avoiding it mostly pointless.
The point of double ini is more so for defense, where it is supposed to be built around amazing stall and forces attackers to do heavy defaults to bait out the defensive util first before they hit, in these scenarios double scan isnt ideal as the problem isnt locating attackers as they will be forced into heavy defaults which will spread them across the map, but its delaying them until they commit, double scan simply provides less util to delay with when instead teams will normally just run kayo or tejo with a scan ini which has much better stall.
The same idea is also for attack. FOr instance if ur attacking on lotus and u want to take c mound at the start of the round, having a dog vs a dog and a dart or drone will provide basically the same immediate info, so its useless using 2 pieces of scan/reclear util at the same time. But since ur only using 1 reclear util like a fade dog, then u wont have value in having a second ini to help take space if its only util is a scan ini's util, versus if u a kayo or tejo then a molly or flash will help a lot more in taking that mound space. So then u might think the advantage is that the second scan ini's util can instead be used to reclear a or b main later in the round. However, because there is only one duelists, there usually isnt enough tempo to clear c mound and then immediately reclear A or B and still have someone (the single duelists most of the time) who can instantly solidify and actually take space based on the scans info. A single scan ini is usually enough to gather all the information needed for those later reclears, a second scan ini can still provide info but info alone isnt nearly as valuable if there isnt a duelist nearby to immediately convert it into map control, teams will exploit this heavily by contacting and reclearing space that an ini just recleared since they know the single duelist couldnt solidify that map control based on the tempo. Simply having flashes and mollies is way more valuable.
also we are in a double duel meta and double duel counters double ini generally.
sorry if i wrote a lot, i did this to solidify my own understanding into words as well. :D