Mate if your alts had somewhat 'decent' gear last patch, you have enough ilvl to im for CR even now. If you were running with your +12 scouting, same as many others, we are happy not to see your alts there now 
From my 13 CR alts, 9 I did not have to touch at all, bc they were already 10+ kaias, 2 needed upgrading weapon from dl/anni to kaia (11k gold, np), while dc scouting armor provided 60 improved needed to make kaia armor pcs to +4 (and yes, that's about what you need there 11 weapon, 4/4/4 armor, so if you had what you call 'decent' gear, you have it with no issues). Last 2 heals had to grow from +0, but I was able to farm the missing improved in all other cr runs. So I would not say getting alts for CR is any issue in a long term, even if you invest there, you get the mats and gold back in 2 weeks.
Dude, I have 16 chars as well, do you think all of em had the 479 ilvl, not even half of em....lol
Yes, I had mats to gear up 13 of em ((5 was geared up already basically, and I was doing CR with 13 chars before the change too, since 3 char is still only lv69 and was too lazy to lv em up to 70).
I only enchanted when there was an enchanting event, which didn't occur everyday but 2-3 months only, I did spam wintera as well for transformers for feedstocks and for feedstock itself as well, so what's your fking problem?!
"Mate" , as long as the scouting gear was an option ingame and as long as anyone could easily get them to +12 - +15, in order to go CR (1/2 times a week), is not relevant why and how you geared your alts (+10 kaia/DL/anni) . You chose that .
Also, going in a 20-man RAID , not 5-man dungeons , all those +12-+15 scout alts alltogether could finish the run. Oh , yes..pardon me, was taking some minutes longer than your all +10-+15 kaia chars .. but after all, the problem was not the damage rate, but the afk-ers that only entered dung then just wait or those that were engaging boss fight with just 0.1% HP.
Not even this is the issue .
As OP said, lowering ilev required for 498 dungeons would allow new players to IM those dungeons in +10 ..+12 ..+14 kaia and progessively improve their gear and skills. They would never get to +15 in a day or 2 , as to meet the present IM requirements for 498 dungeons, so they need to run HIGHER level dungeons , thus improving their skills as well .
Running same 3 instances with facetanking all of them bosses cant really provide them too much learning of their class and skills, dont you think ?.
Nevertheless, better geared players, using +15 kaia or soul gear have the option to LFG for dungeons runs and avoid „lowbies” whose only option is to IM .
"your fking problem" ... this is really a constructive attitude and surely reflects "problems" that people like you have 
This is the "constructive feedback and suggestions" section of the forum. If you cant refrain yourselves from negative and combative statements against threads in this section, feel free to spill and spit your rage elsewhere .
Hat ?? You have a ..a...hat ?? What you need it for..there's nothing to cover in your case o/