Accelerating IBD with more intelligent UTXO pruning was the topic of "Accelerating IBD with SwiftSync" at this year's MIT Bitcoin Expo. TLDR...or maybe TLDW...you can get the correct final UTXO set f...
Thanks, there are devs that worked on SwiftSync also helping out with Libbitcoin (by evoskuil). To find out what the limit is we can push IBD to on various hardware configurations, from small form factor PC to big servers.