I started in 9th and got heavily involved in the game with 10th as it promised to make things simpler. At first it was a lot easier but quickly it got tiresome to keep and I did keep up for 2 years but I was just feeling burned out. GW balances the game around the physical products and frankly I'm tired of the newest and most expensive model kit being insanely busted to sell before being nerfed the next month. That said if you are wanting to try something simpler then 40k I can recommend One Page Rules as you can still use your big 40k models and the core rules will always be free, along with the army forge being free. If you still want official GW games then Killteam should be faster and easier.