The maximum one tends to get with Wi-Fi 4 (802.11n) with two chains (e..g many laptops) is ~70Mbps so it's a reasonable match for VDSL2 here in the UK where the internet link isn't much higher than that is many cases, often less. So having 100Mbps port for the internet connection is fine.
One tends to start looking at Wi-Fi 5 (802.11ac) when your underlying internet link is >VDSL2 speeds such as on Virgin Media which can be 200Mbps or even higher. So why does the hAP AC Lite still only have 100Mbps ports? That Wi-Fi 5 connection is never going to go above 100Mbps is it not? I assume that connection between two Wi-Fi connected devices would run at >100Mbps but that's an unusual case.
I kind of expected the internet port to be 1Gbps... am I missing something or is the hAP ac lite rather limited in use?
In my apartment in London I got Hyperoptic symmetric 150 Mbps installed. I was using their router, but I happened to have a hAP ac lite TC around, so I swapped it. I have just two laptops/3 cellulars in London, so everything was perfect, but I wanted to have my VPNs around, so I swapped and used it for a while. One day I was testing speed out of curiosity after reading this forums. I was getting roughly 90 Mbps bidirectional with a cable plugged, and about the same on wireless, as the place is quite benign in terms of radio interference.
I was feeling greedy and wanted to squeeze to the last bit, so I bought a hAP ac^2. Now I get 150Mbps bidirectional in speed tests, both with cable or wirelessly, but honestly from the point of view of users I'm not sure if I can tell the difference. Everything takes roughly the same time, even backup using VPN to my main place seems to be taking the same time. If I had 300Mbps from my ISP the difference would have been more noticeable, but for 150Mbps I would just "waste" 50% of a mostly unused capacity.
I would say: if you are in a tight budget, or you appreciate that the hAP ac lite dissipates about three times less than ac^2, or you like the ability to control the leds of the "lite" to show things instead of ports, lite is good enough. Notice that 0.008kW*24h*30days means ~1 pound per month in electricity for the hAP ac lite TC, vs 0.021kW*24h*30days that means ~ 2.6£ for the ac^2. I don't know how close to the maximum are them under light load, but this is another difference that, say, a hotel or a students building might consider if they are installing one AP per room...
So definitely I don't think hAP ac lite / lite TC is worthless.