The game is not for speedruns as far as I understand. It is for leisure, creativity, long run time spending.
Resin as for today is one of the bottlenecks/key resources for the game flow - the designers intentionally make it as such for the gamers to play more: you explore the world, you look for resin, you cannot start mechanisms until you have enough resin etc.
Same as getting to copper age makes you able to have saw->planks->tons of blocks and mechanisms.
Same as resin is the key for steel making via pulverizer.
Balance.
So it is not about making it easy to get resource. You should not get resin easily. If you want it easy - open creative mode.
It is about making alternatives with the same availability and timing. If previously you had to spend RL 4 hours to acquire enough resin for steel making - with the alternative way you have to spend the same RL 4 hours to get enough glue, when playing niche or rarer situations where you just don't have pines: challenges, servers, special spawns, customized world temperature generations etc. Yet it should be part of vanilla, not mods.
BTW - evaporating may be implemented with alcohol equipment set, not just cooking pot. Less code to code. Same evaporating mechanism, different resulting product, still must have an ability to take it from the bucket.