Is it worth upgrading from (ROCK) NUC5i5 to NUC8i3(or 5)?

However I am much more interested in what Intel are doing with the Austin Beach range.
https://simplynuc.co.uk/austin-beach-chandler-bay/
So a fanless Chassis, with the I/O elements on-board and then a separate (up-gradable) commute module. This would make a future-proofed ROCK based server.
https://simplynuc.co.uk/cmcr1aba-i3-full/ so with a i3 Module with 8GB RAM, and a 128GB NVMe M.2 SSD for the OS, this is a £500 option - and if/when more CPU is required, swap out the compute module for a i5 etc.