Used memory calculation

[ferre111]

Due to this issue, the MemAvailable metric was used to calculate the used memory on Linux platforms. However, this decision was later reversed after a discussion in this issue. If I understand correctly, the primary argument for this reversal was to align the calculation of used memory with that of the procps tools. But now these tools use the method mentioned in the first issue. So I would like to ask if there is any more reason why MemAvailable is not use to calculate used memory?

[planet36]

top, free, and btop use the "MemTotal - MemAvailable" approach, at least on Linux.
htop is an outlier with this.

https://gitlab.com/procps-ng/procps/-/blob/master/library/meminfo.c?ref_type=heads#L724
https://gitlab.com/procps-ng/procps/-/blob/master/man/free.1?ref_type=heads#L32
https://gitlab.com/procps-ng/procps/-/blob/master/man/top.1?ref_type=heads#L584
https://github.com/aristocratos/btop/blob/d1680735d9329884c2d46f545a36df32ca5e40cf/src/linux/btop_collect.cpp#L1721