On the whole LH vs SH issue and waiting for hours etc. I’m only a few weeks into the company but the only ones that i have met who joined on LH were all type rated on 330, 350 or 777/787
Have not seen anybody doing an initial type rating on the LH fleet new in the company. This could change in the future of course.
Personally, i would not worry about LH vs SH and would just get onto that seniority list asap…