Its tedious because it constantly happens. I don't think anyone is suggesting its the only factor, we also have poor players. But when you witness a team turn on form when they are chasing a league, and then completely capitulate when it really matters, coupled by multiple poor performances in Old Firms when it matters most, its hard not to mention it as a massive contributing factor.
Would be great if we didnt have to be tedious, but we've watched the same shite on rinse and repeat for years.