1. Alexander Gear is the "fresh Level 60 gear", which you can obtain while farming the token items in Alex.
2. Poetics and Law usage is down to crafting materials or desynthesis Leveling stuff. So it does not hurt most People to spend these Stones. Esoteric Stones are untouched and you can obtain the other 2 while getting esoterics.
3. You can still obtain Centrurio Seals, while obtaining Allied Seals, which are almost pretty much useless (except for Glamour).
The "hurting" part hits mostly high Level crafters who use their Law Stones and their Beastmen allowances to obtain crafting materials for Law and Ixal Crafting materials.