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I purchased both a GS305E and two GS308E switches and really like the performance and configuration functionality, but it's missing a key feature -a Configurable Management VLAN. Please add this feat...
Which is fine....except that they are literally sold as "Managed" switches - it even describes the product as this on the front page of the user manual. Aside from specifically googling "GS305E Management VLAN" (and finding these posts) there is little to indicate that this isn't a feature - it's not even obvious from the branding. The only clue is that it doesn't say "ProSafe" on it, (which, notably, also do not list this as a feature) however over the years of using netgear switches, I can say that most of these have supported management VLAN In recent years (however this hasn't always been the case!!)
Given that the system is responding to an IP address by (essentially) scanning for a series of binary strings in a network packet, simply scanning for an 801.11q tag is not going to be a significant increase in load. The costs here would be in support, testing and engineering - my bet is that this is a reference design with some netgear branding on it. Which is a shame, as I opted for netgear as a "recognised brand" against all the experience that tells me otherwise. Instead, the solution (for over 1000 sites) will now use our second choice (TP-link Omada). Their 5-port SG105PE is price-identical, but includes this (and other) significant features.
Your argument that "'Educated' network engineers should know better" - Sadly most experienced network engineers I know will say "Don't buy Netgear" for exactly these technical reasons and there respective support responses!. They will point you at Nexus for datacenter\carrier switches, at Catalyst for enterprise networking or direct you at UniFi for access solutions that "just work" or, for cheaper solutions they will point you at TP-Link.