The biggest thing you will notice with the three races is if you wanna play like a pro you just copy there build orders right? This is great if you wanna play pro prot you just 4 gate than a move, if you wanna play like prot terran tlo you just 6 rax or 1 rax 3 factory or whatever and a move. But if you wanna play like pro july zerg you have to ??? oh wait you can't just make exactly 4 gate or 3 rax and push out you have to use your brain and queue each unit as you need them. This makes it impossible to copy a pro zergs strategy because all there strategies are made up on the fly.
The other downside to zerg is it's really bad ability to counter T & P units e.g. mutas are great but get countered by marines the first unit T makes. Ultras are great but get countered by stimed marines, banes are great but get counted by tanks or stimed marines, broadlords are great but get countered by stimed marines or 1 viking, hydras and roaches are great but get counted by marauder marines tanks with stim just incase. Zerg units are many in numbers but paper thin (cept mass roach).
I played zerg for a long long time and in fact fruit dealers wins were the main reason i switched to zerg as a main. After a long long while I decided to play protoss after only playing prot a handful of times my win ratio went up 20% compared to my months and months of zerg practice simply by making death balls 4 gate etc.
Now i'm in the process of playing terran and considering switching to T as a main they are very good if you can drop and multi task but due to the nature of mech being so slow the protoss death ball is far better at mobility being that colossi don't need to seige up to do splash dmg with ff to help out.
Limiting yourself to one race reduces your enjoyment of the game e.g yey another 4 gate game woot. If you wanna be able to say your the best sc2 player you goto play random that's why imo tlo is pro sauce, and if you don't wanna play random and think your race is unbalanced switch you'll have more fun learning a new race strats rather than nerd raging over loses and imba.
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