Is watching pro play the best way to learn valorant?
Yes and no.
You need to understand the basics of Valorant and overall FPS fundamentals in order to absorb the knowledge from professional matches the right way, it's not like you're climbing 5 elos just because you started picking Jett on Lotus because X player did that when you don't even know how to dash + updraft in A, so don't just copy what other people are doing, follow their steps, but try to understand why are they seeking that path or approach to those situations.
I mean, it's really situational, most of pro fundamentals can be taken into your game (isolating 1x1 duels, crossfiring, off-angling, angle clearing, etc), but most more advanced things like comps, 70% of their playbook and other things that rely on team collaboration might just be a trap tbh as your team will most likely not even listen to you, fuck your entire calling throught the match and just tilt you (Premier could work as you usually play with friends and they're more prone to listen to you tho).
As a person who has owned and managed quite a few Esports teams, and mind you i am in Gold/Plat, so the aim level is totally different, but when the coaches and players are working on strats and when they are playing tourney games, i do like to watch and study their game, the util usage is something i would take from watching them play, and the comms too, tho my solo queue teammates wont comm on the same level, i like comming alot so they cant blame me :) but one downside of watching soo much pro play is that i rage alot more watching my teammates waste their util.
But there are levels as well, since we play in SA, and we scrim SA teams, our coaches only prep for the SA level of play, but when we scrim Korean or sea teams, like DRX Academy, the level of util usage is insane from them is Insane, they never peak without util, so doesn't matter how good we aim, we always get our a** handed to us. But since then, we are exclusively scrimming non SA teams, so our strats and util usage is as good as theirs, huge improvement.
sorry for the yap session
I believe it's all about mentality.
I don't blame most of those teams for not having the "I-want-to-win-everything" mentality, they're usually more focused on just keeping their jobs, specially when most of, atleast in SA, professional players from Valve/Riot games are so lazy and accommodated and satisfied with being mediocre, waking up just 10 minutes before scrims, neither the ranked players who are constantly forced to play against those same "pros" (tier 2-3 arrogant people who think that they're better than everyone when they're in this good position exclusively because franchising took the actual good pros from our everyday enviroment) who just troll their games by playing differently from what they would play in actual tournaments, people win trading, etc...
Most orgs just come here to gather fans and the region's overall level will stay the same as it's impossible to evolve here. The rare decent projects like the LG/SK lineup and world champion LOUD will just move to NA/EU anyways LOL