Tools run off of biofuel, which is the only use for it after reaching coal energy, but the jetpack runs off of fuel from coal production. Having to carry around biofuel, an extremely early resource is kinda annoying and it doesn't really make sense that tools can't run off of fuel made from coal, but can only run off of fuel made from plants (or maybe it does and I dont know the difference in fuel types :)) either way, slightly annoying to have to carry around old resources that i've already surpassed in terms of advancing in technology.
In addition to this, having to hold on to my chainsaw while in my base just because i know the trees i previously cut down are going to respawn through my floors and walls, possibly blocking truck and walking paths, is quite annoying. Since wood isn't needed as a late resource, perhaps consider removing the tree respawn mechanic or at least prevent trees from respawning in areas that have foundations/walls/conveyors built