I have come to the conclusion that we have so many strikers in LD due to the fact that anyone watching the game sees strikers getting the most kills.
Watching strikers is easy, the things most quickly learned are what armors and weapons to pick. (Valiance, Polaris, FF, BTB, GF, Brandishes, BKC, Wolver line, Chaos cloak) They also learn that going for combos is dangerous (short of WMRH, Polaris, GF, DA)
Watching guardians is depressing, short of tanking 2-3 hits for a teammate they are quickly flinchlocked and overwhelmed by the horde of enemy strikers. Aside from team support during a camping session they have few devoted users.
Watching recons is near impossible. Short of the Chaos cloak charge spammer most recons never stay visible when confronted with an enemy. As soon as recon cloaks you camera shift to another player (usually a striker or a dying guardian). Without the opportunity to see how a good recon moves to counter striker or guardian they learn nothing other than the fact that haze bombing recons get Polaris spammed, sword/gun recons get found out by FF/BTB, Argent peacemaker/sentenza fire and then get GF comboed.
I like watching myself play guardian.
I look sexy.