I appreciate your transparency regarding the origins of your reservations, but they are not reservations I share because (from the perspective of the Dhamma) I am completely indifferent
as to whether things exist or not - as my reckoning will have no bearing on what is true in that regard. Taking the "vertical view" and restricting it to "the all" (sabba), such concerns do not penetrate.
Accordingly, I do not lean one way or the other, or feel any drive to protect realism from idealism, or vice versa. Thus, all this Mahayana, Sarvastiva, svabhava, three time periods etc. business that seems of importance to you, does not find any relevance with me.
"Do not force others, including children, by any means whatsoever, to adopt your views, whether by authority, threat, money, propaganda, or even education." - Ven. Thich Nhat Hanh
"The uprooting of identity is seen by the noble ones as pleasurable; but this contradicts what the whole world sees." (Snp 3.12)
"To argue with a person who has renounced the use of reason is like administering medicine to the dead" - Thomas Paine