My goals:
1) Make outdoor light switches controllable from multiple locations and subject to automated on/off switching according to daylight hours.
2) Improve functionality for some improperly installed 2 and 3 way switches (currently only turn off and on if switches at multiple locations).
3) Add additional locations for some switches by using keypads.
4) Add switching capability to some lighting outlets (and media area to control children's usage).
5) Make some use of scenes to control multiple outputs (vacation lighting, all off switch, remote backyard lighting control, Low level night lighting for trip to kitchen, etc...)
6) Future capability to include some security features, temp and water sensors, notification?
7) Preferably able to include control for wifi devices and switches, and with a good android compatible controlling app.
Concerns:
1) Cost and Reliability/longevity. Many switches such as closets, utility rooms bathrooms probably aren't worth the cost/effort as no real functionality gain. Infrequently used switches may make sense to convert if I can expect them to last the lifetime of my occupancy, but not if there is a 10% a year attrition rate on all switches.
2) Compatibility between manufacturers and standards. I would like to not be locked in to one proprietary standard and then have to replace everything in the future as opposed to incremental upgrades.
3) Local control. I don't want to open my house to google, amazon or any other company with no real oversight. I want to have everything controlled/controllable myself even when offline, make changes myself, no blackbox system installed by a company I need to call out every time I need a change.
So far I liked what I've read about the UD ISY system and think it would fit the bill. Am I correct in this assumption or are there better options? Do I need to plan to stick to a single platform, say Insteon versus say Lutron? Can you mix and match should some become unavailable in the future (I've heard about potential longevity issues with Insteon)? Timely advice would be helpful as there are holliday sales I would like to take advantage of.