
Sorry but that is totally
not true at all!
First, I use APC's PowerChute and CyberPowers' PowerPanel software on multiple UPS systems here - and have for many years. They are NOT "shit" software. They are not fancy but don't have to be. More importantly, they work - perfectly.
Without the inter-communications cable and associated software, if you have an extended power outage and the UPS batteries run out, your computer will come crashing down. That is NEVER good as it can result in a corrupt boot drive, or worse.
But with the inter-communications cable and associated software monitoring the UPS, the software will trigger Windows to "gracefully" shutdown and properly power off the computer
BEFORE the batteries run down. That is a HUGE advantage that alone makes using the inter-communications cable and associated software more than worthwhile.
There are other advantages and nice features too. For example, with the software, I can see,
1. Current load the connected devices are placing on the UPS,
2. Estimated battery runtime left,
3. Current battery charge percentage,
4. Initiate a self-test,
5. Read logs, to include the reason for past transfers to battery power,
6. Actual line input voltage (very handy).
I can also,
7. Set UPS sensitivity,
8. Set times to keep the alarm silent,
9. Set high and low voltages for battery intervention.
Those are just some of the things you can do with the software - but only if the inter-communications cable is used.