Designing one's own system to fit one's playstyle has advantages, notably
the satisfaction of having design (or modified) the system to suit rather than simply copying, and
a better fit for that playstyle.
Something that should be noted about some of the builds by cubfan and the other hermits: the Hermitcraft server is populated by quite a number of very high-level/expert players. As a result some of the solutions they build are exceedingly overpowered for more typical playstyles.
In the case of the storage system about which you ask one of the first considerations is the degree to which you have access to shulker boxes: without at least a few dozen shulkers there would be small advantage to simply lining them up.
Second, you need to consider your play style. Unless you commonly do builds that have you moving shulkers full of materials, a less resource intense system might meet all your needs quite well.
Third, there is little point to a million item capable system if you use only a small fraction of that capacity. Smaller systems are faster and easier to build, simpler to fix/maintain, and create less lag. Several smaller systems dispersed across the map may alos reduce the average haulage distance to new builds.
Of course if you want to build a million items storage system just because you can, none of the above apply.
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WARNING: I have an extemely "grindy" playstyle; YMMV — if this doesn't seem fun to you, mine what you can from it & bin the rest.