How would there be lack of accountability?
Long tenures increase the risk of corruption, where politicians develop cozy relationships with special interest groups and lobbyists. The feeling of utmost security in their positions can easily make one become complacent, less responsive to their constituents. When politicians face re-election in worse conceptions like "dissolution of term limits in entirety", along with the norms of lobbying and accumulation of power that ruins equal voting in candidacy for people trying to surpass their regime, This results in less transparency and weaker mechanisms for holding them accountable for their actions. "But wxcked just hold them accountable while also having it be the way I want" simply not how that works.