For me, it would be all of the kits Kraken RC recently discontinued. We have plenty of kites hanging from 1/8 scale, down to 1/28 scale, but the large-scale market is sorely lacking where kits are concerned.
To the best of my knowledge, the only 1/5 scale kits currently being produced are the gas & electric versions of the HPI Baja 5B. Of course, the blame can't be placed entirely on the manufacturers...consumers are a HUGE part of the problem, especially those having gotten into the hobby in the last decade, and even moreso those having gotten into RC since the pandemic. Newer RCers just don't understand the concept of "build it yourself"...they just want RTRs that they can take out of the box, insert charged batteries, and bash them until they break. Heck, many of them don't even know how to repair their own RCs...they take them to local shops, and pay the shops to repair the vehicles for them.
In all this, they are missing out on (at least) 50% of the enjoyment of RC, which is building vehicles. The problem with producing 1/5 scale kits is that the production costs are higher...partly because the parts (being larger) are more costly to manufacturer, but also because the lower volume increases per-kit costs. If more RCers could discover large-scale RCs, and (to a greater extent) those newer to RC could discover the enjoyment of building kits, this could (would?) help manufacturers in releasing more kit versions of large-scale RCs.