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Never in my life have i seen a group of ignorant people all gathered in 1 place. Sleep, just like evasion, has no problems and are balanced with counters in game. The problem is that in a competitive environment the need to include counters to these options is over-centralizing when team building. Yes, you can include counters to sleep and evasion on your team. The problem is that including those counters makes your team fundamentally weaker to a team that doesn’t abuse sleep or evasion, which causes more (but not all) games to be decided on matchup rather than player skill thus being less competitive. In addition, the restraints this places on team building can potentially need every team to run a status curer or an anti-meta counter to the top OU sleep spammers. This will lead to teams being less unique and having high usage for good counters, lando-t is a good example of this philosophy as many people hate lando but smogon players love him because he is the glue that can make many different other mons and strategies viable through his existence on a team alone. If sleep and evasion were legal you would see other mons that specialize in being the glue that allows a team to be viable to rise, the only problem is there are only 6 slots on a team which leads to the earlier stated problems such as similar looking teams and a stale metagame overall.