[rif]

I've researched vlans, so know the basics. I just can't seem to get my mind over the last few feet to cross the line of practical understanding.

Should I create a vlan on my home network?  tldr: Should I put all of the IoT stuff on a separate vlan?  Is the added complexity worth the benefits?  I see no reason why a lightswitch would potentially need access to my phone for example.  Amazon Alexa Echo controls them.

My home network:
   A ton of IoT devices (light switches, air cleaners, electrical outlets, anazon echo...)   
   A bunch of computer-like things (tablets, phones, an actual computer...)
    Infrastructure stuff (router, wi-fi APs, managed and unmanaged switches...)
    6 security cameras

The cameras and the infrastructure equipment is all Unifi network (the router is a ubiquiti edgerouter, close enough to call it unifi)

The ubiquiti edgemax router (er-4) will easily set up the vlan. It has 2 independent lan ports (not a switch).
The actual switches are either managed, or set up as "dumb" switches.

It's worth to note that a lot of the light switches and other stuff require internet (wan) access to work, for some unknown reason.

[Doublej]

The answer is... it depends.

What issues are you trying to address, what are the solutions out there to address them and why do you consider using VLANs your preferred solution to address the issues?

[rif]

I really have no good answers besides "that's what you're supposed to do".   Everything works now, perhaps I shouldn't touch it.

[Doublej]

Creating VLANs will be more secure, but you may have to switch your phone or tablet to the different VLANs to see/control devices. For example my AVR and streamer need to be on the same VLAN  as my phone and tablet for the phone and tablet to control them.

You can map out a plan and then do it one VLAN at a time to see if what works for you.

[rif]

That's a good point about the tablets and phones having to be on the same vlan.  I think that decides it, I'm not going to create the vlans.  It would mean almost everything is on the same vlan, which defeats the purpose.