Because most car and SUV buyers don't want an engine that intrudes into the cabin, or a long hood.
There are solutions. The staggered cylinder bores is one, and the Hurricane’s block is another, with even the cylinder sleeves taken out. The slant six was borne of the need to cut length; the slant made room for the (now obsolete) distributor and such. (I'm pretty sure it wasn't a height issue, Willem Weertman made it clear they'd only had room for a four cylinder. FOrtunately slanting the new straight six engine, by allowing for side-mounted distributor and such, was about that length.)
There are solutions. The staggered cylinder bores is one, and the Hurricane’s block is another, with even the cylinder sleeves taken out. The slant six was borne of the need to cut length; the slant made room for the (now obsolete) distributor and such. (I'm pretty sure it wasn't a height issue, Willem Weertman made it clear they'd only had room for a four cylinder. FOrtunately slanting the new straight six engine, by allowing for side-mounted distributor and such, was about that length.)