If you're going for WC or any large scale conquest, 75% DIP tech reduction is hardly a major boon. At the point where your tech is so far behind you should already be so far ahead of anyone that DIP tech levels don't matter anymore."Neighbour bonus is now +5% per level, and can now reach up to 75% off, to let late westernisers have a chance to catch up."
Does this apply also to countries in same tech group (western vs western)? If so, then that is seriously OP.
For a world conquest you can easily stay at 3 diplo tech and maybe 14 admin tech. 75% bonus later on would be an incentive not to tech at all (exepcet for military tech), only do do it later.
Yay - you have 25 level 22 ships - here come my 400 level 5 ships to slaughter you anyway.