Tại sao VMware ESXi 8 xài BusyBox mà không phải là Bash shell mới nhất?

vmware -vl
VMware ESXi 8.0.2 build-22380479
VMware ESXi 8.0 Update 2

sh --help
BusyBox v1.29.3 (2022-12-06 08:51:38 PST) multi-call binary.

Usage: sh [-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS] / -s [ARGS]]

Unix shell interpreter

ll /bin/sh
lrwxrwxrwx    1 root     root            35 Sep  4  2023 /bin/sh -> /usr/lib/vmware/busybox/bin/busybox

/usr/lib/vmware/busybox/bin/busybox --help
BusyBox v1.29.3 (2022-12-06 08:51:38 PST) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list
   or: function [arguments]...

        BusyBox is a multi-call binary that combines many common Unix
        utilities into a single executable.  Most people will create a
        link to busybox for each function they wish to use and BusyBox
        will act like whatever it was invoked as.

Currently defined functions:
        addgroup, adduser, arch, ash, awk, basename, bunzip2, bzcat, bzip2, cat, chgrp, chmod, chown, chvt, cksum, clear, cp, crond,
        cut, date, dd, delgroup, deluser, diff, dirname, dnsdomainname, du, echo, egrep, eject, env, expr, false, fdisk, fgrep, find,
        fstrim, getty, grep, groups, gunzip, gzip, halt, head, hexdump, hostname, inetd, init, kill, ln, logger, login, ls, lzop,
        lzopcat, md5sum, mkdir, mkfifo, mknod, mktemp, more, mv, nohup, nslookup, od, passwd, poweroff, printf, readlink, reboot,
        reset, resize, rm, rmdir, sed, seq, setsid, sh, sha1sum, sha256sum, sha3sum, sha512sum, sleep, sort, ssl_client, stat, stty,
        sum, sync, tail, tar, taskset, tee, test, time, timeout, touch, true, uname, uniq, unlink, unlzop, unzip, usleep, vi, watch,
        wc, wget, which, who, xargs, zcat

whatis busybox
busybox (1)          - The Swiss Army Knife of Embedded Linux

busybox --help
BusyBox v1.30.1 (Ubuntu 1:1.30.1-7ubuntu3) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list[-full]
   or: busybox --install [-s] [DIR]
   or: function [arguments]...

	BusyBox is a multi-call binary that combines many common Unix
	utilities into a single executable.  The shell in this build
	is configured to run built-in utilities without $PATH search.
	You don't need to install a link to busybox for each utility.
	To run external program, use full path (/sbin/ip instead of ip).

Currently defined functions:
	[, [[, acpid, adjtimex, ar, arch, arp, arping, ash, awk, basename, bc, blkdiscard, blockdev, brctl, bunzip2, busybox, bzcat, bzip2, cal,
	cat, chgrp, chmod, chown, chpasswd, chroot, chvt, clear, cmp, cp, cpio, crond, crontab, cttyhack, cut, date, dc, dd, deallocvt, depmod,
	devmem, df, diff, dirname, dmesg, dnsdomainname, dos2unix, dpkg, dpkg-deb, du, dumpkmap, dumpleases, echo, ed, egrep, env, expand, expr,
	factor, fallocate, false, fatattr, fdisk, fgrep, find, fold, free, freeramdisk, fsfreeze, fstrim, ftpget, ftpput, getopt, getty, grep,
	groups, gunzip, gzip, halt, head, hexdump, hostid, hostname, httpd, hwclock, i2cdetect, i2cdump, i2cget, i2cset, id, ifconfig, ifdown,
	ifup, init, insmod, ionice, ip, ipcalc, ipneigh, kill, killall, klogd, last, less, link, linux32, linux64, linuxrc, ln, loadfont,
	loadkmap, logger, login, logname, logread, losetup, ls, lsmod, lsscsi, lzcat, lzma, lzop, md5sum, mdev, microcom, mkdir, mkdosfs,
	mke2fs, mkfifo, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mt, mv, nameif, nc, netstat, nl, nologin, nproc,
	nsenter, nslookup, nuke, od, openvt, partprobe, passwd, paste, patch, pidof, ping, ping6, pivot_root, poweroff, printf, ps, pwd, rdate,
	readlink, realpath, reboot, renice, reset, resume, rev, rm, rmdir, rmmod, route, rpm, rpm2cpio, run-init, run-parts, sed, seq,
	setkeycodes, setpriv, setsid, sh, sha1sum, sha256sum, sha512sum, shred, shuf, sleep, sort, ssl_client, start-stop-daemon, stat,
	static-sh, strings, stty, su, sulogin, svc, svok, swapoff, swapon, switch_root, sync, sysctl, syslogd, tac, tail, tar, taskset, tc, tee,
	telnet, telnetd, test, tftp, time, timeout, top, touch, tr, traceroute, traceroute6, true, truncate, tty, tunctl, ubirename, udhcpc,
	udhcpd, uevent, umount, uname, uncompress, unexpand, uniq, unix2dos, unlink, unlzma, unshare, unxz, unzip, uptime, usleep, uudecode,
	uuencode, vconfig, vi, w, watch, watchdog, wc, wget, which, who, whoami, xargs, xxd, xz, xzcat, yes, zcat