I grew up playing both Dota and then Dota 2. A very common mechanic is simply making educated assumptions on where the enemy team might be because the map in Dota is simply too large to be covered by vision. I simply translated that same mechanic into Vainglory. In 1.17, we were introduced to the mechanic that prevents the scoreboard with items from being updated until vision of the other team is gained. I don't feel as if this change has had very much impact on the importance of scout traps especially during the early game. However, late game vision is particularly important especially when people start purchasing infusions. If you don't have vision of the enemy team, they could all come out of their jungle shop with double infusions. But again, using flares at this point and determining whether or not your team has this advantage is very important.

I would honestly advise lower tier players to buy scout traps. Especially when playing in a solo queue situation. Players just don't have the game knowledge or alertness to effectively keep track of different jungle rotations nor the proper tools for communication in order for this to be an effective strategy in regular solo queue.

I find that he frost burn is ok, but not optimal in some situations, consider the 3 second codlin on it, if you use quibble and waste it what then. (technically 4.5 second). but it also has very good use if used properly, so it all depends on preference.