In theory it might be optimal to specialise in a single format, and then I guess, you can say, that playing any other format negatively effect your strategy and discipline in your prefered or main format. But for most people it get extremely limiting and unpractical, if they cant even mix MTTs with or without bounties.
Also PKOs make up such a large percentage of online MTTs these days, that it might make more sense to ask, if playing to many non-bounty tournaments negatively affect your PKO strategy and discipline rather than the opposite. Playing only PKOs as a specialization might make more sense these days than playing only non-bounty tournaments.
It sounds like, you dont really like PKOs, and if that is the case, then dont play them. Its allowed to choose the games, you enjoy the most, without looking for excuses about other games "negatively affecting your strategy and discipline" or there being something wrong with the games, you dont enjoy as much.