I’m not sure the purpose of Tweets like this. The are inaccurate and misleading.
Nobody needs an employer plan to save and invest for retirement (although a match from the employer surely helps). On the other hand, long-term saving and investing outside a qualified plan has certain tax benefits too, like paying taxes at dividend and capital gains rates rather than ordinary income plus no required distribution.
Nevertheless, employees can’t be made to wait longer than twelve months and most employers use a six month or less waiting period. Not a crisis.
So, nothing is stopping anyone from saving, nothing.