I'm still waiting on that doorbell camera...

Personally, I wish companies would start working together and allowing integration.  They're hurting the consumers due to their desire to want a bigger piece of the pie.   Smart homes are the thing now and until all companies can give a customer everything they want (which won't happen), they should allow these devices a secure and safe way to work together.   Wouldn't it be great if I could hook my Wyze cam up to SimpliSafe?   Those cameras are just as good or superior at a fraction of the cost!  Alexa works with them so why can't she work with SimpliSafe?
It would also be great if smart locks and other video doorbells could be linked to a SS system with a QR code.  Things like this will not happen anytime soon due to corporate greed and feuding between the giant tech companies and the consumer is losing.

Complete integration isn't THAT important.  Besides, there is no guarantee at this point that the mythical SimpliSafe doorbell will meet your specific needs anyway.  I believe if you find a product that DOES meet your needs at a price you are willing to pay, that you buy it.  What is really needed, isn't the same set of products from every vendor, but an easy to use integration tool that can coordinate and control the various systems.

{Golly! if only Alexa or Google Assistant could do that sort of thing!}

@bob.russell2468
I don't know your specific needs, but I can speak for myself in that if I have the Simplisafe interactive, I don't have to pay the additional fee for the Ring doorbell.  You could save yourself 30 bucks a year if you were able to just use the SS monitoring for your doorbell.   Also, I use Wyze Cams to supplement my home security network, since the cams from SS are like 100 bucks.  Having all of this stuff on one app would be good, and that way you don't have to flip through different apps during an emergency.  So, if you get an alarm, you can be on the SS app and just flip through all your cameras from there.

Also, Amazon, Apple, and Google don't play nicely with each other.  If you like the features of Echo, but you want a thermostat that isn't offered by Amazon, but you like the Google thermostat, well, Alexa isn't going to talk to it for you.   Google also cut Echo Show off of connecting to YouTube directly over this little spat they had with each other.  

Lack of integration hurts because if you get one system, you're stuck with getting peripherals for that system.  If you want a new system, you have to revamp everything.   I wasn't just talking about security systems.  Although, if you have some stuff left over from ADT, you can't integrate that with SS and you'll have to buy new entry sensors.   It's really a cost thing.  You have to buy new stuff for every single system you want to switch to.     Sometimes, it's necessary if it's a security concern, but if the things all used the same signal and could hook up to the same network, it would really add up.    Imagine being able to have all the stuff in your house from different companies all work together with the same app.   Being able to fully monitor, secure, view, and control your home from a single home base and pay one fee a month.    

That's what I hope to see one day.  Integration makes things simpler, and, in the long run, prevents you from having to run out and buy the same peripherals from the same company.   I didn't say it's possible, it's just that I hope that it might happen.