Technically, it can - it has a possibility to impersonate a 3A socket.
Legally, it can’t - it’s not a compliant cable if it does that, as there’s no guarantee it will be plugged into a 3A capable socket.
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According to this web site listing for the Dell HA65NM190 (model number of 65W USB-C power adapter) the following voltages are supported
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That provides the additional confidence that they will do the right thing - negotiate 5V and 3A max. If connecting to that charger, you should use the above cat command to confirm.
I daily drive mine, but it is charging overnight, during the 50 minute commute, and at my desk when working. I usually take it with me if I go into the field at work, but that is rarely for more than a few hours. The only time a really run it into the ground is on a rare weekend.
As a lark, I tried my HP laptop dock (used for a work computer that I rarely bring home) and it is charging FAST (PD, 3A). 
I only own the one battery that came with the phone, which 3 years old.
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cat /sys/class/power_supply/tps6598x-source-psy-0-003f/uevent
why if you type this into the L5 when it isn’t charging does it return “POWER_SUPPLY_VOLTAGE_MAX=5000000”?
Does the phone default to metric style micro-units (i.e. micro-volts, micro-watts, etc.) for power data? No unit information is listed in the terminal script.
[Moderator edited formatting.]
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Because you need to look at the instantaneous current relating to the battery to see whether the battery is actually drawing current - charging - or the other way round - discharging - or neither. Different incantation. (And remember that, assuming that the phone is booted, which must be the case in order to run shell commands, power in from the power source is used for two purposes i.e. running the device and charging the battery. The command in the post you reference relates to power in from the power source.)
The 5V max is just telling you what the power management side of the Librem 5 negotiated with the power source - and as far as I am aware it will always be 5V.
Yes, having everything in microthingies without saying so is not maximally helpful. (Personally I use a shell script so that it can be formatted properly.)