I think tradition has some effective lategame bonuses, but they are more synergy-based. The additional writer/artist/musician and GP rate are still effective, but their long-term impact is increased if you have great work bonuses or other GP-related bonuses. There's also the 15% yields in the capital, which synergises with great works and anything else that gives huge yields in the capital e.g. Arabia's UA, syncretism, god-king. And there's the growth bonus, which is also dependent on having the right amount of cities and happiness to be impactful lategame. In contrast, Progress's scaling bonuses (10% building production, happiness, great writers) are good in most circumstances, although the happiness bonus is only relevant if you have enough cities that you experience considerable unhappiness. The worker speed bonuses are also nice if you're conquering, building war roads, repairing pillages etc. This is one of the ways I conceptualise the difference between the two trees (and many things in VP) - I usually only go tradition if I can leverage some synergies with its bonuses.