That's not the way it was explained to me, and my real life experience of neck sizing only over a decade ago and then moving to FL sizing everything and never neck sizing anything for the past several years does not bear your explanation out. My necks split long before anything else, and that is 30+ reloads in. Half decent dies and more importantly: properly cut chambers in rifles, do not exhibit any of the characteristics you are attributing to FL sizing.
That is more concerning. If your brass chambers just fine and then requires brute force to get back out, then FL sizing won't fix it. It sounds like you've got a different problem. Do you have any pressure signs: ejector swipe, flattened primers? Does the 0.200 datum measure larger on a fired "beat the bolt open" piece of brass than on a loaded round that chambers fine?
Long freebore doesn't necessarily sink the accuracy, it just makes it more difficult to tune a load with a specific bullet. Basically you will need to try different bullets until you find one that likes to jump in your gun. My 6.5 creedmoor shoots very well jumping 147 ELDs some 0.080 to the lands. My 22-250 isn't picky about seating depth on 40 vmax: 0.010 jump up to a 0.040 jump with the 40vmax all group pretty much the same.
If you're sensitive to barrel heat, and want to have long barrel life, then the 22-250 isn't a good choice. It's a hotrod, plain and simple. You won't find much better barrel life with heavy bullets in a fast twist either. It's still a large charge of powder in a small bore. To see appreciable gains in barrel life, you'll need to move to a different chambering. On a 478 bolt face, you can't go wrong with a 6BR. Less powder and a larger bore = probably 2x the barrel life of a 22-250.
I never had a neck split - I anneal my case necks. I have been neck sizing since the late '50's. I don't even own a FL sizer for most of my rifles.