Defending title in Ligue 1 by being the richest team with zero debt because of oil money, well, not really a big achievement. So yeah as I said, they bought talent and won it because of that, not because of tactics, tho last season they showed that tactics with good good talent.
With already very good player resource and with their abundant money, they can improve their squad anytime in either summer transfer market or winter transfer market if necessary. It makes very big advantage of PSG against all competitors in Ligue 1 and they have very high chance of successfully defend their title in Ligue 1. I am surely Ligue 1 title is not their main interest while defending UEFA Champions League title is never easy.
Its less about improving what they have, its about improving tactics and strategy, this was lacking for such a long time because they thought they could buy talents and win everything.
They might already lose Hakimi soon if the legal things become true, so that already gonna need urgent replacement. Donnarumma already they got replacement.
Treble is the only thing I always said will be what PSG is worthy of doing with all that $$$