4-Pk Kasa Smart Full Color 9W A19 800 Lumen Light Bulbs (KL125P4) Expired

What you are doing right now is akin throwing a fit when someone explains that a 1GBit/s cable internet connection will not actually be 1Gbit because of node congestion and line quality.

These are great bulbs. I've been using a couple of these for several years in my Alexa based smart home. Just be aware that these bulbs are 800 lumens (equivalent to 60 watt incandescent bulbs). Kasa makes brighter bulbs of 1100 lumens, but they are more expensive. Kasa (TP-Link) makes very good products.

If you have Home Assistant (or similar) for your automation and you are starting, I'd recommend Zigbee or Z-wave devices. A few wifi bulbs like the ones from this deal are OK, but you could get in trouble (signal drop) as you keep adding wifi devices to your network.
If you live in a small apartment and don't plan on adding too many bulbs, then these will work.
Zigbee and Z-wave create their own mesh network which makes it more reliable and they use a different protocol so all you wifi devices will be OK.
For Zigbee devices I think Philips Hue are the best/more reliable but of course way too expensive. Ikea TRÅDFRI are recommended and not too expensive. Seng led are cheap but I do not recommend them since they won't act as router/repeater for the Zigbee network, compared to TRÅDFRI or Hue (unless this was changed recently).
The downside of Zigbee or Z-wave is that you also need a hub/gateway to control your devices but since you are asking about automation, I think at some point you will have to deal with some sort or hub (RF, Z-Wave, Zigbee). I think some Amazon Echo devices can act as a Zigbee hub but I'd recommend using something like a Zigbee USB stick and running zigbee2mqtt and then you can do all your automations in Home Assistant and/or Node-RED.
Good luck!

Bulbs are not good repeaters as they are not always powered on. Stick to smart plugs for repeaters.

When you say "not always powered on" are you referencing an external switch that may turn them off, e.g. when i foolishly pull that tantalizing brass pull chain on my reading lamp, or do they cease to work as a repeater when i say "Alexa, reading lamp off"?

I'm throwing a fit? Sit down, you're about to get learnt.

I work for an ISP and have for 10+ years. I work in martech which means I understand the technology and I also understand the marketing. I'm very aware of how advertised speeds and real world speeds work. However, NONE of that has anything to do with how the google wifi devices work.

First, you're using the terminology wrong. It's Mbps or Gbps. This speed is only important in a few ways. What the modem can handle, what the ISP provides, and what the hardware limits are. Google Wifi devices, as per this discussion, are limited to 1gbps to the modem because of the 10/100/1000 nic inside each puck. However radios are capable of wifi-to-wifi connected devices of more. I don't recall what these devices can do but that's irrelevant.

You mentioned "The 200 devices number comes from the default DHCP range (192.168.86.20-250=230 IPs available with some room for devices coming in/out)."
Wrong. The network class used is not how any hardware manufacturer makes client claims. Never seen one. it's always hardware based.

You then mentioned "The 100 per point is because they're assuming any given devices is never taking more than 1Mbit/s"
Again, wrong. The number of devices aren't based on speed, they're based on hardware limits. Again, pulling from their tech specs (which is what I read, not marketing material), each google wifi "puck" can handle up to 100 clients. That's a hardware claim, not a DHCP range or anything having to do with speed.

Then this "(1.2Gbit/s max speed, they're reserving 200Mbit/s for overhead in their marketing, 1Gbit/s / 100 devices = 1Mbit/s per device)."
1.2 Gbps is likely wifi-to-wifi speeds, not what can go through the NIC but I didn't read that part. But there is no "overhead" per se. My AP can handle up to 1300 Mbps even though it has a gig nic and this is because two wifi connected devices communicating to each other that don't require communication through a switch or router can communicate up to those speeds, which are relative speeds. Also 1 Gbps is 1000 Mbps making your last part completely wrong.

And lastly, "If one device is streaming video at 50Mbit/s you've "lost" 49 possible devices on that point until it is done streaming."
This is NOT how networking devices work. You are trying to relate speeds to connections and that's just not how any of this works.

Go do some research before you consider responding again.

Beware if you use these with a dimmer switch, they produce a loud buzzing sound. I will be returning mine