Setting your sarcasm aside,I mean tunnel vision as in not paying attention to the map,visual and sound cues and so on. Many players set their mind on doing something and ignore anything else no matter the situation.
Marquis sniping the sentry was simply not expected, but getting up hard to reach terrain(the “backdoor” ledge) is explained in the PROLOGUE/TURORIAL so it’s clearly intended and I doubt will be “fixed”.
I also don’t know how wards relate to tunnel vision,maybe you’re just not familiar with the term, let me google it for you:
tunnel vision: (informal)the tendency to focus exclusively on a single or limited objective or view
besides,in Overgrowth it takes roughly 10 seconds or less to get to the 1st sentry. In games like LoL or DOTA it takes around 30 or more dependent on movement speed. The maps in general are a lot smaller compared to MOBAs,so I don’t see “backdooring” as an issue, since you can get anywhere on the map extremely quickly and there’s no “jungle” you can disappear into after your backdoor attempt.
In addition,hurting a sentry when it has full shields takes time(even with ISICs ult),so if your team ignores the sentries icon constantly blinking then it’s their own fault if they let it get damaged. As I said before- it’s extremely easy to push someone back from that ledge and then keep them off it once you know they’ll try it again.
One thing that should be done is give the sentry a better angle and aggression as it often ignores being shot from that place if the player hugs the wall.