OP, you are not alone, I call this Snipers Hide syndrome and find the more time I spend on this accursed site the more stuff I buy, or want or... I will tell you this, earlier this year I bought my first AI, an AT that shot amazing, then I had an opportunity to buy another "newer" AT so sold the not so old one to get a newer one with skins I really like. Right now I have two barrels, a 20" 308 AI bbl and a 26" SJA 6.5 Creedmoor barrel, the Creedmoor is the newest addition and I've been consistently shooting the best groups I've ever shot with that combo. But now I'm thinking of getting a magnum bolt face from TrophyHunter and spinning up a 7 SAUM barrel, but my buddy swears by his 25 Creedmoor that ballistically matches my 7 SAUM pretty far out, and just the other day I was pondering a 284 Win and whether or not I could get enough speed in my short action for that to be worth it... while thinking of all of this I realized that I love how good my 6.5 Creedmoor shoots so why on earth am I even thinking about another cartridge especially now when components are so hard to come by - it's because we have a disease for the "next shiny thing" that is a product of our consumerist society that specifically markets to our appetite for newer and better.
Specific to your dilemma - is the AI worth it? I absolutely think so. But they are heavy rifles so if you're thinking of taking one into the field to hunt with keep that in mind, I would not want to be carrying that 17lbs (with scope) beast around the Rocky Mountains where I hunt. But if you don't travel far from your vehicle when you hunt that may be a non issue for you.
Unless you plan on getting an AXMC then it seems logical you would keep your 300WM LRI as the AT is for short action cartridges. Just to help you with your decision, here's a couple pics
With 308 barrel
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With 6.5 Creedmoor barrel
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