Now that would be a fun scene, Bob trying to engage with Alexa or Siri, to try and pick them up, thinking they too are spirits of intellect. Harry would never let him live it down.
Bob is everything he always was, in this form though it gives Harry a significant power up technologically that other wizards do not have, and more importantly with wider society, something Harry expressed an intention to do at the end of Battle Ground. Bob can still take on new knowledge perhaps with even greater capacity and computational power as an aid to Harry. We know there will be Gargoyles giving Bob a remote capacity.
Bob is his current form can act as a discrete server for the entire Paranet, and scan in books new to him increasing his database, supplementing it with material from the internet, on science, history, art and porn (very important given Harry’s impending nuptials.
One could posit as the castle had been taken apart once, that its wards can bear being separated. With Bob is residence, one could take a flattish, rectangular piece of stone and use it off-site to remotely access Bob the Castles capabilities plus the internet, messaging etc, basically a tablet, an Bobpad. Harry therefore regains the use of Bob in battle, whilst Bob is safely ensconced in the Castle. Best of both worlds. And Harry Can look at cat videos. To everyone else or it is just a chunk of stone, as only the holder of the Castle can access it.
I hope Bob doesn’t pick up any computer viruses.