Just because you (or a certain vocal minority) needed “several more attempts” to beat Lagon during your first time doesn’t mean there is a difficulty spike.
Also I think you’re missing the point here.
I’m not saying “I beat lagon on the first try, so you can too”.
I’m saying “Anyone can easily tank everything Lagon throws at you”.
You can do this by visiting the vendors that are in every town and buying gear from those vendors. That’s literally how I did it in the video, I removed alt gear that gave me ~370 Ward per Second and I equipped gear I bought from vendors in town.
But it is feasible for new players.
If you think new players cannot feasibly buy items from the vendors in towns, feel free to elaborate on your reasoning.
See, your “so many people” is the vocal minority here 
How many posters about Lagon difficulty can you find, a thousand? Guess what, LE sold over million copies (source). That’s 0,1% of the playerbase who think Lagon is a difficulty spike. Clearly not worth improving anything.
edit: I shouldn’t do math before my morning coffee 