Personally Ive never come across beech as a block, the ones I used were traditional butchers blocks, made by butcher block makers and made of maple.
The fact beech wasnt chosen might have more to do with the properties, as bitd beech was available but they used something else. Possibly the beech splits more when you hit it with the cleaver, or shrinks/expands more but I think if it werent the case they'd have made it from beech and not maple but they didnt and used maple.
I think the actual reasons are long lost in the mists of time.
Thinking on it, I wonder if water absorption has anything to do with it. and the cleaning, which is done with a wire brush that is made of thin flat stainless steel wires, rather than round.
For those unfamiliar with how to clean one, you'd use boiling water to soften the grease/blood, then put sawdust over the top ,then using the wire scraper to go back and forth for a god ten minutes, then dust off with a brush and give it another wipe with a wet cloth.
You learn quickly how to use a block scraper which is up and down rather than side to side as if side to side the scraper 'rolls over' and stabs you in the wrists. lol I learned that lesson pretty quickly
Nice to have a butchers question, as I worked as a time served butcher for just under 15 years post apprentiship, in shop,abattoir and wholesale.
I have found Teak on table tops, as in front of shop, and got a 12' long 2' wide 2" thick board just when I left the trade to retrain as a furniture maker. It was our front shop long shelf/table for displaying steak cuts. Changed it out for stainless and i was lucky the owner offered it to me for services rendered
Shame I cut that up actually, but ive some of it as drawer fronts/rears on one of my own pieces.
Possibly find beech is used is psudo 'butchers blocks' that are really just stacked off cuts you get in cooking shops because beech is really cheap.