It seems to me, looking at the original query and the subsequent comments (which include many suggestions for what people, really really want (apologies to the Spice Girls), that if GLiNET are serious about soliciting feedback and suggestions for a “Travel Router” from their (mostly existing) customer-base (here), they would do better asking about (or polling) “What do you want in a Travel Router” rather than whether the thing has grooves or not.
Essentially “grooves/no grooves” is a cosmetic issue and whilst “the aesthetics” (with potentially a ventilation function) certainly plays a part in the design, in my view asking folks “select in order of preference, your top 5 attributes of a travel router from this list of ten items”, provides a far higher level of customer engagement.
I was reminded the other day about a Steve Jobs (no affiliation 
) speech in which he (paraphrasing) says start with what the customer WANTs and then “Engineer” the product to match, not the other way around.
Here is an example list, culled from the feedback above: Size, Weight, Shape (here’s looking at you LupusE…), Power Brick Size, Ruggedness, Fan/No-Fan (like TP Link’s AC750), Wifi Speed, # of Ethernet Ports, Ease of Setup in Hotel Environments, User-Defined Buttons, (Easily) Customisable Lights (not necessarily using LUCI, but in the standard menu) etc…
I would not include items such as customisable fan cut-in and cut-out temperatures as this may affect the warranty.
Just my observation on any given Friday…
k.
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