This. I think it's a problem they didn't think of when they introduced firemaking (or... they did think of it, given the function of the whole fire-making thing, but they hope we didn't). Traditionally, idols were valid to F4 for a F2 season and F5 for a F3 season, because that means everyone still has to survive one vote without idols/advantages to get to the finale. When they introduced fire at F4, they got rid of that one 'level playing field' tribal.
Given they're determined to keep fire-making, idols should stop at F6. Everyone has to survive the F5 vote by the power of their own game.
Between the idols, fire-making, and this season EoE, the whole premise of the game (having to avoid being voted out) is getting so diluted it barely matters.
Also this came up briefly in the S38 finale thread, but I can't help but feel like it's weird that the first six people voted out of EoE got two chances to get back in, the next eight got one chance, but then Victoria and Lauren got no second shot. It seems vaguely unfair that there's no advantage to making it further in the game, and in fact after a certain point you're actually disadvantaged by the existence of EoE, despite playing a better Survivor game.
A fix for the first part of that would be weighting the returnee challenges - say there's an 'untie all these knots' component, and for every vote you survived in the game you have one less knot. Not insurmountable, but maybe enough to discourage a player like Joe looking at being voted out onto EoE early as a valid strategy.
There's no fix for the second beyond taking EoE right up to F3, which would be awful, but I'd personally vote for nixing it at the merge. If they need to run it to F6, then definitely no idols handed out just for returning (you're already getting a second shot, you shouldn't get an advantage as well), and the post-EoE vote-outs get an extra jury vote, or to boot one EoE member from the jury - something to influence the game and make them a bit more dangerous.
Ideally though we just never see EoE again, but if they have to...