The argument 'it worked a year ago' shouldn't be used, unless you absolutely insist on receiving some canon explanation that people then angrily discard. In the end, any edition rebalances will mean tech changes. Merely saying 'knowsofts/linguasofts used to be allowed to use cloud computing, now they're no longer allowed by matrix protocols' is already enough to explain the nerf, and honestly, does it matter? Ware became cheaper, more expensive, cheaper over editions. We no longer use individual skills. Metatype points changed, qualities changed, the entire system is rebalanced and so there's no point in going 'well things worked differently in previous editions'. We're living in this edition, and we're arguing from what we have here, not what we had in the past.
Right, but we have canon explanations for why things have changed over the course of different editions:
The Unified Magic Theory explains why the Traditions work differently than they did in the past, how Force/Drain works, what type of different spirits can be summoned, etc.
The Wireless Matrix Initiative completely redefined what the digital world was and how deckers and Technomancers accessed and manipulated the information within it, while the Grid Overwatch Division represents the "in-game enforcer" of why the new Matrix rules work the way they do.
Qualities such as low-light vision and dermal deposits are available to all Metatypes at chargen, with SURGE and geneware being examples of why they have that option instead of needing augmentations that were necessary in previous editions.
Between 2078 and 2080 something happened that warranted Skillsoft technology to get blasted back to 2050. This doesn't just affect the Shadow Community, as it's been stated repeatedly throughout editions that the majority of "skilled labor" is represented by chipped wage slaves. That's a huge, world changing decision without even a summary explanation. I'll just assume it has something to do with the fear surrounding Cognitive Fragmentation Disorder or somesuch.
There, I made a plausible reason for having to nerf he second-most important, pervasive tech in the world. You can have that one for free.