The weird thing is your Moto handset is getting an Android upgrade. But when I just looked at Lenovo Android tablets, they all seem to be 2 or even 3 Android releases behind the latest. I don't really care about getting upgrades in my phone, I just want the security patches. Many people just want a phone for communications, though with bigger ones many use them instead of tablets. But yet they don't upgrade their tablets, which are mostly used for the computer-y things.
Which I guess means I'm getting an iPad. I only renew phones when needed, but with harder use, they tend not to last much more than 3 years. Whereas my current iPad is 4-5 years old, so I expect more effort in updates.