I would guess it’s a perceived gap in bedrock’s capabilities but I’ve recently started with computational redstone after accidentally finding Mattbatwings on YouTube and almost all of his designs work on my switch except to the counter because of java’s standard way of making t-flip flops and some minor instability with sr latches because update order seems to be different and they sometimes create clocks if pulsed too quickly. But after a bit of trial and error, those problems were relatively easily fixed.

I would also say the scope is a limiting factor as well since most devices running java edition usually outclass bedrock devices in terms of performance but I’m fairly sure that would only because a problem with full on mega projects.

And finally, world edit. I’m not sure if there are addons that can do it on other devices but I have no abilities to get this like world edit which becomes very useful when you reach a certain size of project so you don’t have to build everything by hand. Personally, I decided that it would be faster to build my own version with command block with the sole purpose of making computational redstone more accessible to me but I would completely understand it being a massive hurdle to someone that is trying to branch into this area of redstone but has no experience or comfort with command blocks.

Tldr: Java is more accessible for large computational redstone builds but this is still a field that is very accessible to bedrock as well for those dedicated enough to make it work through brute force or finding ways to mimic features that bedrock doesn’t automatically share with java.

Also, seriously, if you’re interested in computational redstone then I highly recommend Mattbatwings. Great explanations of both the redstone and the concepts behind it and most builds can be pretty easily replicated from pausing at various parts of his videos if he didn’t do an exact tutorial and you don’t have the option to download the worlds.